★ 5

My partner and I had such a positive experience doing 2:1 training for one year with Benny. We wanted to combat our sedentary desk jobs through general strength, mobility, and building a fitness routine. We trained 2x/week with Benny, focusing on a mix of cardio and functional strength training. Benny met us where we were and helped us slowly and steadily improve. She listened carefully, incorporated feedback, offered gradually increasing levels of challenge, and helped build out workouts we could do on our own. She's also an athlete and Ayurvedic practitioner who understands the many dimensions of our bodies and can help you troubleshoot anything that might be impacting your workouts. After a year my partner and I made gains in strength and mobility, but also built a foundation to move on to other sports. I now powerlift multiple times a week, something I'd never tried before, and my partner has moved on to soccer and rowing. Also--you spend a lot of time chatting with a personal trainer, and Benny is one of the loveliest, most authentic people in SF.

We had occasional sessions with Jae, who is also excellent. Jae draws from a well of technical expertise and will look closely at your form and how you can get the most out of each movement. He'll push you in ways that challenge your specific anatomy. As the studio owner, he's fun, responsive, and kind.

The studio is on one of the busiest blocks in the Mission but once you're inside there's a sense of calm. All of the trainers are friendly and we never had a bad interaction. In short, j+k is a low-key studio with high-impact trainers. I miss training there and highly recommend.

Source: Google

★ 5

I have been training at this studio for about a year now and I have had a terrific experience. I was looking for a trainer who had experience dealing with injuries and could modify workouts and design programs which fit my constraints. Jae fit the bill amazingly. He was very deliberate and cautious about my injuries from the beginning and was able to design routines which not only pushed me without causing issues but also helped me address my injuries as well. In the duration I have been working out at j+k, I have had the amazing good fortune of working with not only Jae, but also Griffin, Adriana and Christina. Most of my sessions are with Jae and Griffin and they are both excellent trainers with very different styles. They are able to modify the programs to meet the varying needs of my schedule and are always very accommodating with regards to scheduling and such. I cannot recommend this place more! The studio always has a good energy and great music. It is well equipped and a fun space to get a solid workout at!

Source: Google

★ 5

Jae and Griffin at j+k fitness have been really great to work with. They've pushed me very hard since the start of the year to improve my athletic ability. I can only say that I have learned a lot about what else I can improve on in the future!

Source: Google

★ 5

I've been training with Jae at j+k Fitness since fall 2024, and it’s been an incredible experience from day one. I'd recently ruptured my Achilles and was still in a walking boot when I reached out. But unlike other trainers I spoke with, Jae not only agreed to work with me, he welcomed the challenge.

My very first training session in fact was in a boot, and Jae still found creative ways to adapt the workout so I could begin building strength safely. From there, he continued crafting thoughtful, highly personalized sessions that kept me motivated, pushed me at the right pace, and helped me stay consistent throughout my recovery.

The results exceeded my expectations: my strength improved dramatically, my endurance increased, and I made meaningful progress in my injury recovery.

I enjoyed the training so much that I brought my girlfriend for a few 2:1 sessions as well. Jae adapted the workouts seamlessly for both of us—making them fun, effective, and a great shared experience.

Lastly, the studio is also worth highlighting. It's clean, well-equipped, and set up in a way that feels both professional and welcoming. I didn’t work with the other trainers, but the environment is clearly built by people who care and know what they’re doing.

Overall, this has been by far the most thoughtful and effective coaching I’ve had in any fitness setting. j+k is a special studio, and I highly recommend it to anyone looking for expert training, no matter your starting point.

Source: Google

★ 5

I worked out with Griffin for the past month and had a fantastic experience. He’s incredibly knowledgeable and helped me build a strong foundation while making real progress toward my fitness goals. I always felt both comfortable and challenged during our sessions—a great balance. Griffin also provided customized workouts I could do at home and made thoughtful recommendations for supplements and equipment that fit my needs. He’s super friendly, professional, and clearly passionate about what he does. Highly recommend!

Source: Google

★ 5

Jae, Griffin, & rest of the team at j+k fitness studio have been an absolute pleasure to work with. I didn't have any prior experience with personal training before joining the studio, and they've definitely exceeded expectations. I appreciate the trainers taking the time to fully explain and tailor the workouts to my fitness goals. I've been going regularly for roughly 6 months and have seen marked improvement in my strength and endurance. My confidence in executing workouts on my own has also skyrocketed.

I've done both individual and partner sessions with multiple folks at the studio and all have been equally professional and knowledgeable. To anyone looking to start, level up, or maintain their fitness journey, j+k is a wonderful choice!

Source: Google

★ 5

I’ve worked with Christina at J+K Studio for a couple years now and I’ve seen so much improvement in my strength, endurance and mobility! Now when I go to commercial gyms I feel more confident and comfortable stepping outside the cardio area and using the free weights or lifting platforms. The J+K studio itself is small but has always had equipment and space I’ve needed when training - I’m glad to be training there with Christina!

Source: Google

★ 5

I’ve been training at J&K since 2022, and Christina makes every session count. She listens, fine‑tunes workouts to my goals, and takes time to explain the why behind every movement. what we’re targeting, how the right form protects myself. so I can practice safely and confidently outside the gym. She's knowledgeable, supportive, and professional. highly recommend.

Source: Google

★ 5

Great studio with awesome trainers in the heart of the Mission. They are very focused on personalized training programs.

I separated my shoulder when I was 19 and it has never been the same. Working in IT for years, jacked up my posture and my shoulder pains got worse. Got to the point I wasn't able to perform certain movements and exercises without noticeable pain. Long story short, these guys are miracle workers. I'm no longer looking like Quasimodo and my shoulder pain levels are the lowest they've ever been. I can even bench press again with noticeable weight.

If you want cookie-cutter training, j+k isn't the place for you. If you want trainers who know what the they're doing, who don't just talk a big game but also walk the walk, and who will customize a training program specifically to help you get the results you need, this is the place.

Source: Google

★ 5

I’ve been training here for longer than I’d like to say, but it’s been hands down one of the best decisions I’ve made for my personal health. Jae, Griffin, and the whole team at j+k have been fantastic to work with.

All of the trainers are incredibly knowledgeable and friendly, and they make sure to tailor the workouts to meet you where you’re at. For example, I used to suffer from pretty frequent back spasms, so the team really made sure to help me build my core strength.

I can confidently say I feel the healthiest I’ve ever been, largely thanks to the team here. Can’t recommend them enough!

Source: Google

★ 5

I trained with Christina for roughly 2 months and have really enjoyed working with her. Christina was super attentive to my training needs/fitness goals, and tailored the workout to help me reach my goal. I’ve also learned a lot of techniques to help me apply at home/my regular gym. Really happy to have worked with her to kick off my fitness journey!

Source: Google

★ 5

Excellent gym with an amazing team of trainers. I work mostly with Benny, who is awesome, but have also worked with Griffin and Adriana and all of them are top-notch. Knowledgeable, patient, and always positive. Workouts are tailored to your needs and trainers are very attentive to injuries. The whole place has a great vibe. Highly recommend!

Source: Google

★ 5

Training with Benny over the past two years has been a true delight. My husband and I go together, with a focus on strength, flexibility, and balance. It's challenging, rewarding - and fun! Benny crafts workouts that address the things we need to work on and keeps it interesting. Jae and team make the gym a welcoming environment, and I always walk out glad I went.

Source: Google

★ 5

I've been working with Griffin for 18 months now, and it's been absolutely life changing. I started after my second pregnancy because I was feeling like I couldn't keep up with my two young kiddos. Now I can handle them easily, and am hitting strength milestones I've never achieved before in my life. Griffin is patient and keeps the workouts interesting. He is skilled at modifications to prevent injury. If Griffin is out of town, J+K has other great trainers who can step in to keep you consistent. Jae and Christina have been wonderful to work with as well. The gym is well equipped and clean and everyone there (trainers and clients) is friendly and welcoming. Highly recommend!

Source: Google

★ 5

Jae is hands down the best trainer in all of the Bay Area. He is extremely knowledgeable about the fitness journey and customizes a program specific to your need. In person he pushes you to your limit and maximizes the time you spend with him. An added bonus, he's very personable and fosters trust with his clients. Cannot recommend Jae enough for those looking to kickstart their fitness journey!

Source: Google

★ 5

Training with Adriana over the last 8 months has been a fantastic experience. She worked with me to create a very personalized program that delivered impressively noticeable results already. When I had an unrelated minor sports injury, she was deeply attentive to avoiding exercises that might be problematic, which made me feel very comfortable. She also gave me detailed notes on exercises to do in between training sessions, helping me establish a regular routine. The studio is also a great space with plenty of room to train without getting in anyone's way. Highly recommended.

Source: Google

★ 5

I’ve been working with Jae and Benny - and sometimes Griffin - for four months. From the first session, it was clear that Jae and his team bring a wealth of knowledge about physical training. He conducted an assessment of my fitness level and mobility. We also discussed my goals, a current limitation, and the fact that I play tennis regularly. With that information, his team focused on building my core strength, agility, and flexibility - all of which have noticeably improved my movement, my tennis game, and provided a boost in my overall fitness and energy levels in daily life.

Their personalized approach ensure that we worked towards my goals and within my limitations. The team’s encouragement and energy are contagious. They strike the perfect balance between pushing me to exceed my limits and understanding when I need to pull back. They’ve also helped me with recovery strategies, including stretching routines and injury prevention tips, which have been a game-changer for someone at in their 50s.

Source: Google

★ 5

The trainers at J&K are stellar! I’ve worked with a few different trainers and each one brings something unique to the table.Adriana and Christina, in particular, are great at listening to your needs and tailoring workouts, especially when it comes to building muscle as a woman. The gym vibe is always positive. If you want to get in shape in a great environment, come here!

Source: Google

★ 5

Jae and Adriana are amazing trainers. It's been a fantastic experience and they put a lot of effort into the training. Can't recommend them enough!

Source: Google

★ 5

I’ve been training with Jae, Christina, and Adriana for 9 months now, and I’m so, so happy with the results! I go three times a week, with Jae & Adriana focusing more on my cardio and Christina focusing on strength-building. I’ve made huge gains in my endurance and strength, and they’ve done a great job at adjusting workouts to help with past injuries or focus on developing certain areas. All three of them are great at pushing me while not letting me get away with poor form, and they’re always super supportive when I need to sit on the floor and wheeze for a bit.

Plenty of other reviews have already covered their extensive knowledge of anatomy and exercises, so I won’t go into that, but I can confirm that they’re always happy to answer my questions about the benefits of a particular movement.

Scheduling-wise, I was upfront about the fact that I wanted to essentially outsource my willpower - I wanted trainers who would be proactive about scheduling sessions and force me to opt-out if I couldn’t make them, rather than someone who would just wait for me to opt in to sessions. They’ve accommodated that request beautifully, and the fact that they work as a team means that I rarely have to miss out on sessions because someone’s out of town.

Can’t recommend them highly enough!

Source: Google

★ 5

Been working out here for 6 months now and Griffin is the best trainer I've ever worked with...he's excellent at tailoring workouts to your capabilities (e.g. if you're nursing an acute or chronic injury he works around it while getting the right stimulus). He's also incredibly innovative in his exercise/movement selection.

The gym is clean, has everything needed for training sessions, and I'm lucky to have found them!

Source: Google

★ 5

Best personal training you could get in SF hands down.

Jae and his team offer a top notch studio with all the gear and equipment you would expect: squat racks, great weights, rogue bikes, boxing bags, etc.

The trainers also offer a range of programs designed for your goals. Griff is hyper focused on mobility so that you are able to build up strength safely without getting hurt. Christina is a pro at powerlifting or olympic weightlifting training.

I came in at 175 lbs and 30% body fat and am now closing 160 Ibs and 20% body fat!

Very happy to have found this nugget in the mission.

Source: Google

★ 5

Training at J+K Fitness has been such a wonderful experience - I’ve been working with Francisco virtually for several months and have seen a big improvement in not just my physique but overall quality of life. It’s been super helpful to have both a place to train and the option for virtual sessions, as I’m often traveling out of town and the flexibility helps to me on track.

The studio is equipped with top notch machines and all of the trainers are super friendly and helpful!

Definitely recommend this place if you’re looking for a personal trainer.

Source: Google

★ 5

Great trainers! I worked with a couple of different trainers for about 6 months. They helped me correct some muscle imbalances, build strength, and set a strong fitness foundation that I can build on. Incredibly knowledgeable and intentional. Would recommend and would go again.

Source: Google

★ 5

I've been training with Benny since January, and she’s fantastic! I've been consistently losing weight and have noticeable strength gains. I love her approach to training, and I’ve been introduced to creative exercises I wasn't even aware of. The gym facility is great, and I plan to continue working toward my goals here!

Source: Google

★ 5

I have been training with Griffin for a few months now and he has been amazing. He is constantly supporting me and pushing me to achieve my goals. I have had a history of muscle weakness and he thoughtfully planned the workouts to help me strengthen those muscles.

Source: Google

★ 5

I took a chance with J+K fitness after seeing people's before and after photos on the website, and glad I did. I've been training with Griff and Benny and seeing great results and learning a lot! They listen to your goals and cater the program to fit your needs. I've been doing both in person and remote sessions over zoom in the gym and even dabbled with remote at home with minimal equipment when weather was atrocious. I was hesitant about the remote sessions at first but they actually turned out great! Would def recommend to anyone thinking about working with a trainer for the first time or for those looking to expand on an already solid fitness base.

Source: Google

★ 5

Fantastic trainers and a great vibe. Worked with Francisco for over 3 months it was a amazing experience !! He has the latest and greatest equipment including high tech metabolism measuring and burning systems to get you to your goals. Plus he is extremely knowledgeable and functional. Probably one of the best trainers i have worked with !! This means a lot coming from someone who has lived in 7 cities in the last 8 yrs in US and worked with a different trainer everywhere.

Source: Google

★ 5

Jae is an incredible trainer. I worked out with him for about a year and made real progress toward my goals thanks to his encouragement, enthusiasm, and expertise.

He nails all the basics – well-rounded knowledge of training and kinesiology, great motivator, extensive experience. What makes him special is how he goes above and beyond.

1) Highly adaptable: we started in training in 2021 and had to work around COVID surges. We trained fully virtual to start, then in person at his Mission gym, and in a hybrid model with me in the gym and him virtual. Across every configuration I got the same high quality of workout and attention. When I injured my shoulder at one point (don’t worry, not during one of his sessions) he deftly transitioned me to a new routine to avoid further strain and rebuild strength.

2) Great communicator: Jae really listens and is so observant during sessions. He took the time to understand my goals, help me identify some obstacles and then built a plan to keep me on track. I really felt the benefit of a 1:1 trainer in our sessions. He’s also a great conversationalist when his workout isn’t leaving you gasping for breath.

3) Passionate: Jae walks the walk. He truly cares about fitness and his clients. He’s also so open with his knowledge that I came away from our sessions with great education in strength training and my own passion for fitness.

If you’re looking for an incredible trainer, accountability partner and champion for your goals, I highly recommend working with Jae.

Source: Google

★ 5

I have been training with Griffin and the J+K Fitness team for over 5 years, both in person and with virtual training. They have a passion for fitness, with a focus on tailoring to each individual client in a smart, efficient and effective way. As a busy professional this is exactly what I need — I come away from each session with a workout that perfectly fits my body’s needs that day, without the need for me to plan or think about anything. The hybrid model is also fantastic for my lifestyle, as my fitness regime is not affected by travel. I can easily take a virtual session from anywhere. This hybrid flexibility highlights the expertise of Griffin and the J+K team. They are able to come up with creative, targeted workouts on the fly in unusual situations; for instance, I’ve had great workouts in parks, my living room, and my sister’s basement.

Source: Google

★ 5

I had an excellent time training at j+k fitness studio. From the outset, logistics were very well handled to account for my schedule by both Jae and Shaina. As for the training itself, Shaina was very meticulous in crafting a holistic programme in line with my fitness goals, challenging me to push my limits while also taking care to be particularly attentive towards the neck and back issues I had outlined to her. In just a matter of a few short weeks I could see very tangible improvements in my overall fitness.

I could not recommend Shaina and j+k more highly!

Source: Google

★ 5

I've had a really great experience training with Shaina S. for the past 3 months! In this short amount of time, I've made a lot of progress and learned the foundations to train confidently on my own. I appreciated how open she was to changing goals and trying out different things. Her sessions were tough, creative, and fun.

The space was really clean and I never saw more than one other client training at the same time. Jae, the owner, is super knowledgable will help with the initial consultation and match you to a trainer based on your goals. Highly recommend!

Source: Google

★ 5

I've been training at J+K Fitness for nearly a year now and have loved my experience! My trainer Joe strikes the perfect balance of pushing me harder but keeping me motivated throughout my workout. Joe is also very knowledgeable when it comes to training with a prior injury. When I first started working out at J+K, I had some issues with my knees. Joe thoughtfully designed a workout plan to strengthen them and now my issues have completely disappeared.

Jae, the owner, is friendly and really flexible when it comes to scheduling. The gym has both in-person and virtual training options and is very clean/respectful of COVID protocols. Highly recommend to anyone looking to uplevel their fitness!

Source: Google

★ 5

I'm a retired pro athlete and I have nothing but praise for J+K Studio and the team. Take aside their amazing training planning, customization to particular cases, creativity, fun exercises and constantly evolving routines. Their attention to detail, the way in which they adapted to the new health standards, and their overall human interaction makes this the best training studio I've every worked with. Five stars? Such standard doesn't even make justice to how great these guys are.

Source: Google

★ 5

Have been training with Jae for years. Helped strengthen my knee/hip post surgeries, and helped me shed unwanted weight in the process. I learn so much about how to train, and how my body responds to strength training and I love it all. The online training during a pandemic incorporates weights I have at home and my own body weight. Jae remains involved online, and I never feel like he's not giving his full attention to me - even via zoom. Highly rated.

Source: Google

★ 5

During my time at j+k I trained with Lee and coordinated scheduling thru Jae. Lee was always kind, professional and very results driven. Expect to be challenged! Lee was thoughtful about how to reach my fitness goals and I was able to see progress in a short amount of time. Communication with Jae about scheduling was easy and he was able to make accommodations with appropriate notice. Definitely recommend the j+k team.

Source: Google

★ 5

I've had an incredible experience with J+K Fitness Studio. It's now been 6 months of consistent training 3x+/week (including via live video during shelter in place) and I'm feeling so much stronger, happier and healthier. Highly recommend J+K. I actually find workouts fun and invigorating and you can get support on nutrition as well. Five stars.

Source: Google

★ 5

I've been going to this fitness studio for the last four months and have seen a significant drop in my weight while grown my understanding of my own body and knowledge of physical training thanks to the solid set of trainers at J K.

My experience with all the trainers have been fantastic especially with my recent experience with Lee. He's personable, knowledgeable and will push you to ensure you're getting the most out the session.

I've also had a very positive experience with Jae, the owner of the studio who provides constant guidance on nutrition and words of encouragement, and Joe, who's extremely knowledgeable about dieting and exercise.

I highly recommend this studio if you're looking for a personal trainer.

Source: Google

★ 5

I've trained with 4 different trainers here, and all have been knowledgeable and had great technique for training and warming up. The gear is in good condition, and all the right stuff (barbells, squat racks, kettlebells, etc) are there. The location might seem really dodgy when you walk up, but it's safe and cozy inside.

Source: Google

★ 5

Great place! Joe and Lee John are both very good trainers, even for beginners like me. Their enthusiasm also encourages me to exercise more. It is not the cheapest training session you can find in town, but it's worthy every penny!

Source: Google

★ 5

I've been working out at J+K for almost a year and this is best personal training experience I've ever had. I started out with an assessment with Jae who not only designed a program for me but checks in regularly to provide nutritional advice as well as to ensure that I'm keeping up with my fitness goals.
Joe has the patience of a saint and is extremely knowledgeable .I've seen substantial gains in my stamina, flexibility and and saw a marked difference in my body after just a few months. I love the 1:1 personal attention and that there are never more than a few people working out at any time in the space. Joe created a tailored program specifically to target my problem areas -taking into account my knee and back issues and incorporated exercises that strengthened those areas to avoid further injury
If you're looking for a great training experience with an amazing team check out J+K fitness- I can't rave about them enough!

Source: Google

★ 5

I started training with Jae a few years ago to get in shape for my wedding. Haven't left since. The studio provides a comfortable environment for one on one sessions, with never more than a few other clients in the space. In addition to Jae, trainers Griffin and Joe provide focused attention to every workout regiment. They are great at adapting the training to a person's pace and goals, and will push you as much as you want to be pushed. Whether you're trying to look like Mr. T, or just trying to remember what life was like before Dad bod, J+K will help you realize the transformation you're after. Highly recommend.

Source: Google

★ 5

Great studio, great trainers. I have been seeing Jae and Griffin for the last six months. They show full care on their members, provide feedback on the progress and make sure the program is designed based on the needs of each person. Jae listened to me carefully in my first consultation and understood my history of injuries well. He and Griffin made sure my program fits development of my strength. Highly recommended.

Source: Google

★ 5

Overall: If you're looking for an effective personal trainer, who will help you meet your targeted goals, Joe is the guy for you!

I started seeing Joe about 9 months ago, post injury. I was a runner, but since foot surgery (and the addition of 3 screws in my foot), running had been really difficult for me. My surgeon recommended I weight train... I had never weight lifted before, and the task seemed daunting, so I decided to seek out professionals to help me in my weight training journey.

9 months of training with Joe, I not only now love weight training, but I've seen a drastic change in my strength. I can deadlift 100+ pounds, my running post-surgery has improved (I'm way faster!), and overall, I feel healthier and more confident given my new-found muscles :)

Honestly, I really look forward to my sessions - they tailor exercises to your fitness level and goals, and it is FUN! The hour flies by. They are super nice and personable... but that doesn't mean they don't push you -- oh boy do they push you, you will be surprised what you can do with their coaching. I highly recommend training with Joe + team at J+K Fitness!

Source: Google

★ 5

I have been training with Jae for about 10 years now, and would highly recommend him. He creates a workout regimen that is customized to my objectives and body condition (innovating on the exercise sets for maximum efficiency while protecting your back if you have one that bothers you for instance). I have found his workouts to be extremely effective and efficient - combining core, cardio and weight training very effectively with real thought into the sequencing of each set. Jae is extremely knowledgeable on other dimensions of holistic health e.g, nutrition and diets, sleep patterns etc.
I have never been fitter in my life and can only thank and credit Jae for that. So much so that even though we have moved from the city, I make it a point to work out with him when I am visiting San Francisco.
The other trainers are great too. My 8 year old son has worked out with Joe several times. Joe makes the training really fun yet functional for him, for instance incorporating soccer skills into the session (which my son loves)

Source: Google

★ 5

I can't say enough nice things about the trainers here. I have trained with Jae and Joseph and both are amazing! Super clean studio, well equipped, and very convenient location, but aside from it all, I think it is the trainers who make this place so special. I came back to training earlier this year, after 2 years of being inactive because of a herniated disc, and totally felt comfortable and at home here! Jae listened patiently to all my needs and requests given my special condition. I can't thank him and his team enough - after 6 months, now I feel alive and my body is transformed thanks to this team!

Source: Google

★ 5

I've been working out with Jae, Griffin and Joe for 9 months, and I've seen a remarkable improvement in my strength and endurance since I started. It's by far the best personal training experience I've had, and I'm really, really happy with my body transformation!

When you train with any of the guys here, you have 100% of their attention. Each session is tailored to your goal and with plenty of variety from one workout to the next. They accommodate your schedule, and they also provide nutritional advice and recommendations on supplements. The studio itself is not huge, but it's always clean and the equipment is well-maintained.

If you're looking for a great personal training experience, check out J+F Fitness Studio. I can't recommend J+K Fitness Studio enough!!!

Source: Google

★ 5

I've been going to the studio now for over a year and the results really do speak for themselves. Jae and Griff are both great to work with and will tailor their approach to your unique situation and goals. It's also great have a small group of trainers to work with interchangeably to create flexibility week to week with scheduling sessions while still getting the 1:1 treatment.

Highly recommend these guys!

Source: Google

★ 5

My time with J+K was absolutely amazing. They hooked me up with Joe, a great trainer with a lot of information about the keto diet. One of my goals was fat loss, and my body fat percentage dropped from 33% to 30% in only 2 months.

Their facility has showers, so you can go in for a morning workout without showing up to work sweaty.

If logistics allow, I plan on returning.

Source: Google

★ 5

The team and facilities at J+K fitness studio is outstanding. Jae has done an amazing job of delivering amazing service and results to his clients, and has also hired and trained a team of dedicated professionals who deliver results to their clients. Jae has worked with me on both rehabilitation strategies when I have had injuries, as well as when I am focused on making strength gains. He is the best trainer I have ever worked with. His expertise, professionalism and personality are great fuel to help his clients to reach their goals.

Source: Google

★ 5

I started with a fitness assessment with Jae at J+K in August of 2018, outlining my goals with a PT, specifically noting I wasn't aiming for "vanity muscles" but more overall strength and stability following a period of back injury and pain. Jae put me through a qualitative assessment and review of where my fitness level was at to start, and where my goals could be met and exceeded working with one of his talented and experienced trainers. I signed up 10 sessions to start, just to see if it was a match.

I was paired with Joe and off the bat, it was clear that he was going to be the perfect fit. Very focused on the muscle/mind connection and how I needed to retrain my brain to work in a different way was unanticipated (I expected, "see that heavy thing, pick it up") but yet incredibly insightful. Over the next year, Joe and I worked together 2x a week to strengthen my entire body, develop and maintain balance, and reduce back pain (which we found was much more linked to my hip and leg than anything else). Over this time a residual effect was my confidence grew exponentially, making me (for the first time in my life) able to not only replicate the work Joe and I were doing at J+K in my own gym, but apply the learnings to create some new movements, lifts, and exercises that work for me.

I am only leaving J+K and Joe because of a relocation out of state, but I would have easily signed up for another year or more, simply because I looked forward to the 1-1 time spent with Joe working on my mind and body, but also the immense amount of learning I was able to apply outside of our sessions. I am sad to go - but I STRONGLY encourage anyone looking for customized, innovative, and non-repetitive but challenging training to look no further than J+K. The team is amazing and you won't regret it.

Source: Google

★ 5

I've been training with Jae and crew for about 3 years now, which should speak for itself. I've enjoyed my work outs with a variety of the trainers here (Jae, Griffin, Joe, Brett, Andrew, etc.) - they are all great. Sessions tend to be a good mix of stretching, core, cardio and weights, but they'll adjust to your preferences. The space is comfortable, clean and casual, and both the trainers and other clients create a welcoming environment, whatever your gym experience. There was a recent remodel of the training space which makes it even more spacious. The entrance is conveniently located just a few doors up from 16th St. BART.

Source: Google

★ 5

Jae and his team are fantastic. On top of my game now inside and outside the gym. Will really help with whatever goals you have.

Source: Google

★ 5

I have been training at J&K Studio for over an year now. The location is very convenient and easily accessible (in the same block as 16th street Bart/Muni stops). All the staff are really nice and have one common goal i.e., to make their client progress and reach their goal. Initially it feels like a very small place but trust me you won't feel the need for more as you start your workout. My goal was to gain overall core strength and gain lean muscle. Though I haven't gained much of lean muscle (partly because of my vegetarian diet), I am very impressed with how I have progressed in my core strength and overall fitness.

I have been working out mostly with Joe and sometimes with Andrew.
Joe: The kind of energy, enthusiasm and interest that he shows in helping me achieve my goal is just simply encouraging. One very good quality of his I like the most is that he makes me do a specific exercise only after he has tried it himself and knows that it works. He is quick in assessing one's strengths and area of improvements and comesup with routines that takes me to a new improved self. He plans a wholesome routine which includes stretching, core, cardio, strength, power, endurance, etc.,. He explains the working and benefits of each exercise. He doesn't quit and won't let me either. Stresses on the form which helps me perform better without any injuries. Oh, I was dead scared about dead-lifts. Can you believe I can lift upto 200 lbs now? Amazing right? That was possible under the able training of Joe. Now, everytime I dead-lift, i break my previous record...haha. I couldn't have been more confident and happier! So much to write but I am sure this will suffice.

Andrew: I have worked out with Andrew a few times. His methods will test your endurance and overall core strength. Andrew's workout routines which he plans for me are wholesome. Always encouraging, pushing me to do my next best set, teaching me new stretches to recover from any tightness, very attentive etc.,. When I am working out with Andrew, he is completely dedicated and very attentive towards me which I really appreciate.

Bottomline, I would definitely recommend this place for anyone who want's to progress from wherever they are currently at.

Source: Google

★ 5

I have trained with Jae and his top notch team over the past few years and can honestly say that it is by far the best investment I have made in terms of keeping myself healthy! Jae is fabulous as are Joe and Griffin. Jae is incredibly knowledgeable and has an impeccable work ethic. He has helped me overcome multiple injuries and is very attuned to each client's needs and fitness objectives. His team and he tailor every workout for each client ensuring that your session is extremely effective and fun! They are constantly changing up your workouts and pushing you in a good way so you can reach and exceed your goals. The studio is conveniently located near the 16th Street/Mission Bart stop. The studio itself is nice and spacious. Every trainer is truly invested in your well being and will partner with you to achieve your fitness goals!

Source: Google

★ 5

Totally transformed me and I've stuck with them over for over 7 years. Whether you are in great shape already, working to improve a solid baseline, or just getting started, the team-based approach works for any situation. Personally, Grif has pushed me to the next level.

Source: Google

★ 5

I've had a great experience with Jae and the other trainers I've worked with. I lost about 15 pounds in a few months and I'm really happy with the progress I've made with lifting. Jae will help with nutrition along with workouts to help you achieve any personal goals you may have. They are very responsive to feedback and will always make adjustments to your workouts based on your goals and any aches you may have. My workouts have consisted of stretching, core work, weightlifting, and cardio. I usually do 3 workouts a week, and its definitely worth it.

Source: Google

★ 5

I’ve been working out at J+K for a number of years and have worked with several different trainers there. I have always had a really great experience and felt very comfortable. I highly recommend Jae and team to anyone looking for a great workout.

Source: Google

★ 5

I've been coming to J+K for over 5 years now, and love it. Over that time there's been some evolution in the trainers, but every one of them has been great - thoughtful, enthusiastic and encouraging. Jae runs a smooth operation and plainly has a good eye for training talent. The overall vibe is relaxed but focused - they work to identify your needs and limits, and then push them... usually in a relatively gentle way, but with a little fierce spice when called for. The space is pleasant and you never feel crammed in, unlike some gyms. Overall highly recommended!

Source: Google

★ 5

I was nervous to do personal training at first, I tried it once before and it didn’t work out so well. But coming to JK fitness was one of the best decisions I’ve ever made.. I’ve been coming here for roughly six months and I’ve lost close to 20 pounds. I’ve trained with Jae, Joe, Griff and Andrew.. They have all been really helpful. They truly give me the push I need to get the results I want. I’m excited to continue working out with these guys. I definitely would recommend this place.

Source: Google

★ 5

I've been going to J+K Fitness off and on for the past 4 years (crazy!).
Couldn't recommend a better place to train with experienced personal trainers who are patient, creative, and acclimate to your personality and temperament.

Every single trainer I've worked with over the years is clearly very dedicated and experienced in their craft and make sure to mix up your sessions so you're not doing the same routines over and over again.

The current trainers I work with (Griffin, Andrew, and Joe) all have different backgrounds and personalities but I highly recommend each and everyone of them. They all bring something unique to the table and it's nice to work with them in rotation.

I appreciate that everyone is very encouraging and motivating, but and there's no BS. Super nice and know how to push your limits, without being overbearing or pushy. Side note, I have some limitations I have to work around (bad knees, ankles, the list goes on) but my workouts are designed with that in mind, and never am I made self-conscious about it.

Definitely give Jae (the awesome owner) and his crew a shot!

Source: Google

★ 5

Went here 3x/week for a whole year. Great space, trainers and price. There are no more than 2-3 ppl training at a time, so plenty of space and room to train. Trainers will work with you on specific goals and even help with your diet. Jae has built a great community in the Mission. Highly recommended!

Source: Google

★ 5

I started a training program in June of 2018. I had been lifting on my own for years and was struggling to add weight and size, so my goals were to do exactly that. The team of trainers at J+K Fitness were able to assess my lifting and eating habits up-front, and design a program specifically for my goals.

I'm about half-way through my program and have gained 15 pounds already. My legs have gotten much thicker which has helped my upper body also get bigger, and as a result I have a much more proportional look.

The workouts are tough, and they are always different. This is a major factor because I don't have to think/research or design any training specifics - I can just show up and rely on the experience of the trainers.

Source: Google

★ 5

Been coming to J+K fitness for about three months. The staff is great, with different trainers having slightly different styles and personalities. It definitely comes through that the training is personal. Every session begins with a conversation of any previous aches and injuries, and the pace and intensity set accordingly. I mainly joined J+K as a springboard to build momentum on a healthier lifestyle, and J+K has helped. Beyond the sessions, Jae will reach out through text messages to follow up on how the sessions went and how my diet was doing. Would highly recommend this to anyone looking for turbocharging their fitness.

Source: Google

★ 5

had the pleasure of training with both Griffin and Joe a few weeks ago - and I'm grateful to have had two different but equally butt-kicking experiences!

My first thoughts of the studio: modern, clean, and tastefully decorated (especially the outdoor wall of plants in the middle of the studio). Definitely appreciated coming into a calm space where I felt comfortable working out in (especially coming in from the hustle and bustle of 16th Street Mission). Plus I liked working with equipment I usually don't see in HIIT classes or gyms (AirBikes, ropes, sled pushes, etc).

I trained with Griffin first, and I appreciated that he welcomed me in at the front of the studio, especially since I didn't know my way around at first. What I liked the most about my session with Griffin was the way he communicated his innate knowledge about the human body/anatomy in relation to the kind of work we did that day (hips/legs). From beginning (good ol' foam rolling - which to this day I don't know why I don't do more often) to middle (assisted stretches and warm up movements incorporating yoga poses like frog pose) to end (more high intensity stuff) - I felt like I was being guided through a well thought out session that increased in intensity linearly and just made sense (as an aside, I liked the "appearance" of said yoga pose...well, because I have a yoga background!). Plus I liked that he was both personable and efficient facilitating our session. I was surprisingly sore the next few days, since the session itself wasn't as explicitly "high intensity" as some of the more cardio-intensive HIIT classes I'm accustomed to (and am usually huffing & puffing in) - but I was happily sore, since I felt like the work was more isolated and targeted muscles I usually neglect.

I trained with Joe a few days later (yes, while my lower body was still sore..) - and "luckily" my session with Joe was more upper body oriented (though my legs weren't totally on vacation - hello glute bridges with bands and sled pushes..). What I appreciated the most about my session with Joe is the knowledge I'll bring with me in future workouts: heavier weights doesn't always mean stronger/better, and movements in exercise are composite aka not just limited to arms but also work the abs, etc (just to borrow an example). Perhaps common knowledge to others, but I enjoyed experimenting with both light and heavy weights/less and more reps in a variety of (hard) movements (including ones I'd never done before) to work both strength and endurance...everywhere! Joe challenged me to think about how I might be able to see exercise as more than "ok, today I'll only do arms, tomorrow I'll do leg day, etc."

If you're looking for a personable, intelligently designed exercise program with people who know their stuff (and want to be enlightened too)...go to j+k. Plus you'll get to see the cool plant wall if you do.

Source: Google

★ 5

Been coming to J+K fitness for about 6 months. Great staff. Trainers are motivating yet not overly pushy. I was hesitant to do personal training initially but now feel like it ended up being a great investment. Would definitely recommend the place to my friends.

Source: Google

★ 5

I have been working out with Jae for almost two years, and have been training with Griffin over the past few months as well. I’m 46 and in good shape, but I have had fairly chronic back pain off and on from an old injury that has required four back surgeries over the years, including a final spinal fusion at L4-L5 several years ago. My lower back and hips were still always tight, I would have consistent flare-ups of lower back pain, and I was seeing a chiropractor on a semi-regular basis.

I went to Jae’s studio with the goal of being able to work out consistently, build some muscle, and get better abs, all while taking care of my back. Jae focused on getting me set up with a great series of warmup/stretching/core exercises that I eventually started doing on my own at home before our sessions (and on off days). During our sessions he focuses on compound movement exercises that include a lot of join mobility/flexibility and accessory muscle groups to improve deep core strength and help prevent any back issues. He always keeps things interesting and different at our sessions with new exercises and stretches thrown in each time.

I will occasionally still tweak my lower back a bit by doing something I shouldn’t (moving something awkward and heavy, overdoing it on a run trying to sweat out a bit of a hangover), and Jae can pinpoint what’s going on and switch up our session in real time to focus on exercises that both stretch and work the muscles that need it, as well as spend a few minutes at the beginning or end of our session focusing on purely stretching if I need it.

Between the at-home warmup/stretching exercises he’s given me, plus my regular sessions at the studio, I completely stopped needing to see my chiropractor after a few months, and my back has been great.

I would HIGHLY recommend Jae’s studio to anyone, back problems or not. Jae and his other trainers work very closely together with clients, and whether I’m training with Jae or Griffin they know my full history, as well as what the other has focused on with me in prior sessions, and tailor things appropriately. And I have abs at 46 while still drinking a little too much wine from time to time!

Source: Google

★ 5

I was hesitant to get back into the gym and start training with some real professionals but Jae of J+K is great to work with. His staff is friendly and knowledgeable and are there for YOU, not themselves.

The gym space itself is fairly large with two individual spaces so even when other members are being trained or working out on their own, you never feel crowded or disturbed while concentrating on your personal fitness goals.

I had back surgery in 2007 and have been worried about getting back to the gym for fear of hurting myself even further. Jae totally helped me strengthen my core muscles with resistance training and kept me on track. Slowly but surely my sciatica pains went away and now I feel comfortable working out on my own knowing the correct form to use when lifting.

My goals are still a work in progress but with Jae's help I have gained muscle, lost fat, and feel a lot more comfortable about myself than ever before. I went from 15% body fat down to 10.5% and I will now take my shirt off when I go to the beach!

Source: Google

★ 5

I started training with Jae years ago and have never looked back! Jae is well versed in his trade, he always puts safety first, and he curates a challenging, well-rounded workout every time. Beyond that, he is interesting and funny, making it a joy to spend a couple hours of my week with him.

When I set out to find a trainer, I specifically avoided big box gyms. I knew a boutique training gym would be better, but the comfortable and jovial environment I've found here has surpassed my expectations. There is truly a sense of community at J&K, and it's a huge part of why I look forward to coming in each week. Beyond that, the studio itself is a great space - it's very clean and well maintained. It's also right at 16th & Mission, which is very convenient for BART commuters like myself!

Source: Google

★ 5

It would be impossible for me to give Jae and J+K Fitness Studio a higher recommendation. I've lived in many cities and I have had many trainers over the years, but none of them come close. With Jae and his team's help, I was able to increase my strength and vastly improve the way I feel and look. They were instrumental in helping me reduce my body fat percentage by about ten percent. Seriously. The workouts were always challenging, but at the same time sensible and designed for me specifically. Jae himself is a smart, talented professional. Unlike some other trainers I've had in the past, there is not a "meathead" bone in Jae's body. I no longer live in SF, and as you might guess, I wish I still lived there for many reasons. Jae and J+K Fitness Studio is one of them.

Source: Google

★ 5

The moment I walked into J+K Studio, I felt comfortable. The studio is well kept and offers an intimate feel while training. There was never more than one other client training during any of my sessions; which allowed me to focus on my time with my trainer, and not be distracted by others in the studio.

I primarily trained with Sean and Natalie, and have nothing but great things to say about the both of them! At my first session, I could sense that they wanted to understand my initial abilities and limits so that my subsequent sessions would be safe and challenging. Whether I was training with Sean or Natalie, they were extremely professional, energetic, focused on me, and were invested in seeing that I had the right tools, training and support in working towards my fitness goals.

I especially liked that Sean and Natalie took the time to explain the reasons why I was doing a certain exercise, which muscle groups they worked, how to properly perform the movements to limit the possibility of injury. Hands down, Sean and Natalie have been the best trainers I've worked with! Sean's energy in every session made training fun and pumped me up to push myself.

If you're on the fence of about training at J+K Studio, do yourself a favor and stop by to meet Jae, Natalie and Sean! You'll immediately feel the energy of the studio, and see how awesome the three of them are. They truly take the time to get to know you, they're invested in your fitness goals and make every session fun and challenging!

Source: Google

★ 5

Jae and team (I train with Natalie as well) are simply awesome.

I have a love-hate relationship with fitness and have tried out several personal trainers over the years. Jae and Natalie are by far the best. It's hard to put into words why but where they really stand out is:

1. A truly tailored approach -- fitness and values
I go twice a week at all times of the day. The J+K team trains all sorts people. From the super buff and toned to people who are just getting started, Jae and Natalie understand how to motivate and challenge people across the fitness spectrum.

2. Awesome workouts
I really don't know how they do it but they manage to push you right up to your limit without it feeling impossible or overwhelming.

3. Fun/Relaxed
What I probably appreciate most about the J+K Studio is the studio's culture. You can feel Jae's warm and accepting nature even when he's not there. As an example, when I did CrossFit and worked out with other trainers, I knew I was getting a good workout but always felt uncomfortable. I love SoulCycle but it's definitely an acquired taste that requires being in a certain mood. At J+K, regardless of how I'm feeling or what happened earlier in the day, I always know Jae, Natalie, and team will be ready to meet me where I am, kick my butt, and have a good time.

Source: Google