★ 5

Source: Google

★ 5

Grit is absolutely amazing! I’ve been with them for over a year an half and I can honestly say it was the best decision I made in my fitness journey! Everyone pushes each other and works together like a team! Their dedication to their clients makes you feel welcome and appreciated!

Source: Google

★ 5

I use ClassPass and was looking for a strength and conditioning/HIIT workout that would challenge me yet keep me interested; so I was thrilled when I discovered Grit Per4mance! Every session is unique so I never get bored and the people provide a warm community atmosphere. Irene (the owner) discreetly evaluates each person to verify they have proper form and technique to ensure safety and mitigate any injuries.

Overall, I am elated to have found this gem and look forward to each class!! I highly recommend the Grit Per4mance and fully support women business owners!

Source: Google

★ 5

Source: Google

★ 5

Source: Google

★ 5

Grit has helped me face my biggest struggles that I've always dealt with: Losing weight, staying motivated, and being consistent. Irene, Manuela, and Hedrick have seriously been such a big help and I never thought I would ever be able to keep this up. I'm so very grateful to have met them and have them pushing me on this journey❤️
As for these people complaining about the noise, all the trainers are very respectful of the neighborhood. The garage door is shut during the AM classes and if I can still hear my trainer over the music, I think you need to rethink your attitude. Maybe come join us since the 5ams/6ams seem to "wake you up"! 😃

Source: Google

★ 5

This place has changed my entire life! I am so grateful for my Grit Team! Our 9:00am class was amazing this morning!! If you’re interested in changing your lifestyle habits and challenging yourself this is THE place to do just that!

Source: Google

★ 5

Great 9am workout .have to come to grit

Source: Google

★ 5

By far, best workout I've had in a long time. Such a strong and positive atmosphere. 9am never felt so good.

Source: Google

★ 1

This gym is absolutely ridiculous. I don’t know if they’re trying to compete for noise level or actually exercise. There is absolutely ZERO reason to be this loud, especially at 5AM. There are families with small children who are disturbed every morning by the constant SCREAMING at this gym. Extremely disrespectful. I understand that they are a gym but the noise level is completely unnecessary and inconsiderate.

Source: Google

★ 1

Obnoxiously loud at early hours in the morning. Be respectful

Source: Google

★ 5

This training facility is truly amazing! I have been inconsistent but when I was going more frequently I had a great experience! The owner and the team really motivate you to be your best self. I was shocked at how much my body can do and I noticed results in just a couple weeks!!! HIGHLY recommend you check out Grit. The owner has really built an amazing, loyal community! Thank you for all you do !!!

Source: Google

★ 5

Great atmosphere to workout at! The energy is so different, they really push you to your limits. Thank you Grit!

Source: Google

★ 1

Horrible neighbors if they don’t keep the noise down at 5am in the morning I’m calling the police next time. Warning issued. Please be respectful

Source: Google

★ 5

I started Grit about 2 months ago, and after the first class it kept me coming back for more! It’s an extremely encouraging workout facility to attend. Everything from the music, clients, to the coaches is motivating to help you reach your goals. This place is great to help you lose weight, gain strength and muscle, improve mental health & anxiety, etc. Best part is that you actually see results after going consistently!

Source: Google

★ 5

This place is truly a hidden gem and it’s a beautiful location with a community dedicated to you and your mental and physical growth. I started coming here 4 months ago and I honestly can’t go a week without coming at least once a week. the sense of accomplishment after a 45 min workout is addicting. My favorite part is the trainers and how unique each of them are, that make each workout so exciting. I had an ACL reconstruction 3 years ago and I never truly felt like myself till now. I always had some kinda pain or soreness to not push myself. Girt changed that mentally after a month. My knee now feels stronger and I have recovered, so much confidence to not be afraid to try any intense workout.

Source: Google

★ 5

Small business with a ton of community support. The owner / trainer works hard to create a great small group environment that’s covid safe but the class still packs a heavy punch with a 45 minute workout. Easy to book on mind body AP. Two bathrooms ( one with shower.) class is a mix of body weight and weighted exercises that don’t feel boring or over played. Masks required.

Source: Google

★ 5

GRIT is life changing. I can tell you it hits all the aspects of The Seven Dimensions: Physical, Intellectual, Environmental, Vocational, Social, Emotional and Spiritual health.

Success. Motivation. Discipline.

Sign up now for the time of your life!

Source: Google

★ 5

me encanta este lugar, trainers hablan Ingles - Espanol , esta es mi tercera semana y me siento motivado , en definitiva recomiendo GRIT la mejor decisión que he tomado..

Source: Google

★ 5

Irene is great! She keeps the workouts fun (& tough)! She is very knowledgable & creative. She makes great use of our time there.

Source: Google

★ 5

I am a person who HATES to exercise. I’ve spent most of my life avoiding it. So I knew that I was going to need a ton of positive feedback in order to stick with something. Grit Per4mance is not easy, and because it’s not easy, you are so unbelievably proud of yourself on the drive home. That’s what has kept me coming back, and the fact that Irene and Joey are awesome is just a bonus. Plus, if you’re self-conscious like me, rest easy... everyone else in class is suffering through the tough workouts too (and therefore NOT looking at you while you sweat and/or struggle with a new movement!) Try out a class, get your butt kicked, and then be proud of yourself. Rinse and repeat.

Source: Google

★ 5

I started going to Grit about 2 months ago, and it's such a hidden gem! It's been the most challenging workout I've done in years. All of the classes get your heart rate super high, burning a ton of calories. It's the perfect combination of weights/cardio. You will feel absolutely exhausted at the end(in a good way).

Every day of the week has a different focus, but every class I've done so far is different. They do a great job of keeping it interesting and challenging so you don't get bored. The music they play is awesome!

Irene is very friendly but also pushes you to be the best you can- please support such a good local business! She's passionate about what she does and you will be so happy you went. All levels of fitness go, so no matter where you are at you will feel comfortable.

Source: Google

★ 5

Source: Google

★ 5

4 months in and Grit changed my life mentally and physically. Irene and her crew care for their clients. I walked in there scared, nervous amd out of place but the trainers and clients made me feel welcomed. We all support each other. Best full body workouts with the best energetic trainers.

Source: Google

★ 5

Everyone should try out grit per4mance!! I have been working out there for over a month now and I have fell in love. Not only is it a great workout that pushes you to limits you may not have thought you could go to, it is a great environment with even better people. It is truly a community of people who wants to not only get better themselves but help lift the people around them. The owner Irene Barrera is wonderful and always has a smile on her face as well as an amazing workout! Their new trainer Joey Carroll is great as well, he pushes you in the best way and I always leave feeling satisfied after his workouts. I would recommend to anyone looking to switch up their workout routine and who wants to get better!

Source: Google

★ 5

I started Grit last week and already feel so amazing mentally and physically. They push you in such an encouraging way while definitely making you SWEAT!! I feel so good when I leave and love knowing that I’m doing something healthy for myself. The staff is friendly and the coaches know what they’re doing. I’m so happy I joined!!!!

Source: Google

★ 5

I joined Grit over the Summer and fell in love. Irene pushes you to be the best version of yourself! She is a gem and your work out crew becomes your family! The workouts are intense but show results that leaving you feeling more confident. Try a class and I promise you won’t be disappointed.

Source: Google

★ 5

Best decision I have ever made was to sign up for a Grit class, I started during the summer and I haven’t been back to a regular gym since. No matter what fitness level you’re starting at, this place is for you. Not only is it a welcoming environment where you can make friends, but you will get fit along the way. You will feel stronger and have more energy throughout the day. Sign up today!!

Source: Google

★ 5

I absolutely love Irene and Grit Per4mance!! I started a few months ago and can see the results in just a short time. I feel stronger, have lost 10 lbs, and have higher energy throughout the day. Grit classes are very motivating and encouraging and I can’t imagine a week without coming here. I wasn’t in great shape when I first started but mentally I feel clear and physically feel strong thanks to Irene and her team for encouraging me every time I wanted to quit. It feels like family for sure. Thank you Grit Per4mance!!

Source: Google

★ 5

Great workout with great people! If you're looking to improve your physical and overall well-being this is the place. Whether you're a beginner or an experienced athlete, Grit makes sure you get your money's worth.

Source: Google

★ 5

high intensity work out! prepare to sweat, move & be sore the next day💪🏻The staff are very welcoming & definitely push you past your limits! I highly recommend grit to everyone!

Source: Google

★ 5

I 10/10 recommend this to anyone it’s a great experience and a great hard workout if your willing to get in shape or even lose weight this program will do both of those things. I loved it, it was a hard workout for me since I wasn’t used to it but by the end of the day I could feel the soreness on my body so I know it worked sign up for gritt whoever is interested it’s worth it.

Source: Google

★ 5

Grit is amazing!!! I have never felt so confident in my own skin and the energy is amazing! If you want to have fun while also gaining strength definitely check this place out!

Source: Google

★ 5

It’s an awesome place to go and get a great workout! I recommend grit to anyone!

Source: Google

★ 5

Best bootcamp ever ❤ ♥.

Source: Google

★ 5

I joined Grit a about a month ago and it has been life changing in so many ways!! This is for everybody of all abilities as well! The works out are intense they push you hard enough to where you never thought you could go! Not only do the coaches coach but they make you feel so welcomed and they feel like mentors. Irene checks in with you personally to make sure you are on the right track and that you are getting what you need. They focus on changing your body and your mind and it is amazing. Highly recommended for anyone trying to tone up, lose weight or just maintain a healthy life style! (:

Source: Google

★ 5

Amazing workouts!!! Irene is extremely welcoming the first time you walk in. This place is for anybody. Do not hesitate coming here, it’s 100% worth it.

Source: Google

★ 5

As a member,after every workout I just feel younger ,healthier, you have to be ready to leave your comfort zone ,take your mind and body to a different level and you'll be surprise what you are capable to accomplish!! I definitely recommend Grit Per4mance if you are ready to make a big positive change in your live!! Their workout routine will make you sweat, I lost 20lbs in 6weeks but you also need to eat better, Plan base meal best decision i made in my life, definitely gave me more energy, great for this kind of workout, you'll see results right away , Im ready to get in the best shape of my live!!

Source: Google

★ 5

I have been coming to Grit for a little over a month. It is a boot camp style gym owned and operative by a Waltham native-Irene-and I love the sense of community and togetherness that greets you every class! John is a really great coach who doesn't let you wimp out! You definitely get a total body workout each class!! Irene offers a free 3 day trial period-don't know of any other gyms that offer this. And class sizes aren't so big that John, Irene and the other coaches have time to watch you and make sure you are doing the moves correctly. Everyone in the class is so supportive of one another too. So glad I joined!

Source: Google

★ 5

Great community and intense (but scalable) workouts. Prepare to sweat!

Source: Google

★ 5

I have not been coming for a long time but I Can honestly say its an amazing workout. If you want to push yourself to the max then this is the place to be at. Instructor is focused on having the best intense workout. Focusing on yourself and becoming better a better you is what GRIT gives to its clients. Workouts are intense but so worth it. I don’t understand why people want to focus on being negative about local small business owners instead on empowering them to grow especially when is a female owner. I am glad GRIT is here in waltham it is convenient, good for the community, and a great way to workout with friends!!!

Source: Google

★ 5

Love this place! I’ve been attending the outdoor bootcamps for months now. I used to work out for years and was in OK shape - but since starting these bootcamps, I’ve been feeling incredible every week. My performance at work has improved dramatically (I get more work done in less time), I feel better mentally, and my physique is also improving a lot.

I love seeing my friends every week at GRIT, it hold me accountable to getting my workouts in

I highly recommend this to anyone that wants to truly improve their mental & physical health!

Source: Google

★ 5

Source: Google

★ 5

Source: Google

★ 1

Terrible neighbors. Can't speak for their product, but they use unauthorized parking spaces, trespass during their "drills", and shout obsenities at their clients in the street, and generally makes assess if themselves early in the morning. Wish these guys would move out ASAP.

Source: Google

★ 5

Grit Per4mance is amazing 😉 guys; When you walk through the door you immediately feel welcomed and motivated. Honestly don't even realize the time when you’re working out 💪 time goes by quickly!!! All of the instructors have great personalities and I love taking every single instructor's class. I would recommend this place to anyone who wants a great workout in an awesome environment, also they speak Spanish and English how amazing right 😇🤩😊

Source: Google

★ 5

Home for the holidays and had to check out grit per4mance and it was unreal! I myself work out everyday and this was something totally new!! Great cardio and full body workout! Wish I was living back home and I would come every week!! Keep up the awesome work Irene !

Source: Google

★ 5

I have been going to GRIT performance since day 2 of their opening and I absolutely love it! I am one that hates to work out but Jon and Irene make it so that you feel motivated, dedicated and most importantly push you to keep going. These past 5 weeks I have felt more energized and happy! I recommend this gym very much, they will push you to your limits and will NEVER let you quit. #LifeStyleChange #FitFam

Source: Google

★ 5

Source: Google