★ 5

We’re about half way through our first program here and I can’t see our lives without it any time soon in the near future.

Coach Billy is amazing. You can tell he cares and his heart in everything he does for these kids. He is kind and his approach to pushing the kids limits are fun. My boys are not burnt out and you can see that they’re working hard but genuinely enjoying it. He focuses on what goals you have for your children and builds on them.

Amazing coaches, gym and routine. Cannot wait to watch our boys grow 💪🏼

Source: Google

★ 5

You know it’s a great program when your kids come home sore but smiling, saying, “It must mean I’m doing it right.” That’s when you realize just how special Coach Billy and Grindathon Athletics are.

Watching your kids grow right in front of your eyes, seeing them push past limits, gain confidence, and accomplish things they once thought they couldn’t, is an incredible feeling. Coach Billy brings out something in these kids that’s hard to describe. He pushes them with purpose, motivates them with heart, and helps them believe in themselves every step of the way.

It’s more than training. It’s growth, discipline, and confidence all in one. Truly thankful for Coach Billy and everything he pours into these kids. 💪🔥

TheRowdyBunch Family - Dad

Source: Google

★ 5

You can tell a lot about a program by how your kid talks about it — and mine couldn’t stop talking about Coach Billy after just a few beach workouts and fun bowl events. Before I knew it, he was asking me to sign him up for the facility!
As parents, we don’t hand over our kids to just anyone. Coaching, to me, is personal — it’s trust, it’s energy, it’s impact. From the moment I stepped into Grindathon, I understood why my son felt at home. You can feel the difference — the genuine care, the way they push kids to rise up, not wear down.
This isn’t just another training facility. It’s a community that builds strong athletes and strong mindsets. They meet kids where they’re at, inspire them to level up, and make the grind feel fun and purposeful.
If you’re looking for coaches who connect, challenge, and truly care — this is the one.

Source: Google

★ 5

My daughter started coming here with her basketball team and since then, I’ve been seeing lots of improvement in her strength and agility. I would highly recommend if your athlete needs another outlet to enhance their abilities.

Source: Google

★ 5

My son had trained with Coach Billy from the start of his football career from Pop Warner to High school. I am one of many witnesses that have watched Coach Billy’s program grow from training at the city parks to creating a great facility in Bellflower. His hardwork and dedication built the Grindathon corporation having a phenomenal team of coaches that have worked with my son as well. Coach Billy and his team will not only physically train with their clients, but will mentor them to become a great athlete. Even though he has a very busy schedule, Coach Billy will find time to come and watch a game. We feel that we have joined the Grindathon family for life. Thank you for always supporting Titus’s football journey.

Source: Google

★ 5

Grindathon Athletics is the PERFECT spot for your child to not only Grow as an Athelete but also as a contributing member to society! Coach Billy and Coach Aery do an amazing job at developing the Youth within the 562 AREA!

Source: Google

★ 5

Our basketball program has been training with Coach Billy at Grindathon since March 2025, and the results speak for themselves. The energy inside the facility is unmatched—high vibes, focused work, and a true culture of growth. Coach Billy strikes the perfect balance of fun and intensity, keeping our players locked in, conditioned, and motivated year-round.

What truly sets Grindathon apart is the consistency. Coach Billy shows up with 💯 effort every session—and that drive carries over to the athletes. If you're looking for next-level training for your team or sports program, this is the place. The results are real, and your players will want to keep coming back for more.

Beyond the training, Grindathon builds community. From competitive football bowl events to everyday sessions, athletes are constantly challenged, supported, and connected. The moment you step in, you feel part of something elite—and it only gets better from there.

Thank you, Coach Billy, for sharing your passion and giving our youth basketball program a space to grow, stay ready , and believe in themselves. Your impact reaches far beyond the court, and we're truly grateful.

Source: Google

★ 5

Grindathon has truly been a game-changer for my 13-year-old son, Noah! Since starting his training here, we’ve seen an incredible transformation—not just in his athletic performance, but in his confidence, discipline, and overall growth.

The trainers at Grindathon are in a league of their own. They bring energy, passion, and professionalism to every session. They don’t just train athletes—they build them. Whether it’s on the football field or the basketball court, Noah is stronger, faster, smarter, and more focused because of the intentional, high-level coaching he’s receiving.

What I love most is that Grindathon isn’t just about physical skills. They push these kids to be leaders, to be consistent, to work hard when no one is watching—and that mindset is priceless. Noah leaves every session better than he came, and for that, we are beyond grateful.

If you’re looking for a place that will unlock your child’s full potential, Grindathon Athletics is where it’s at. We’re proud to be part of the Grindathon family!

#GrindathonAthletics #BuiltNotBorn #NextLevelTraining

Source: Google

★ 5

Grindathon will check off all your boxes when looking for an athletic training facility. It's a program where Coach Billy and the rest of the team will develop your child into a CONFIDENT athlete. The coaches doesn't waste anytime and always has an agenda for the day.

My son, Rilee has been going to Grindathon since August of 2024, and there has been so much progression. He is faster, stronger, confident, and is more determined than ever. Rilee is a really shy kid that keeps to himself, but having group sessions with other kids allowed him to interact with others. He started in group sessions, moved to semi-private, and is currently doing private sessions with Coach Billy (skills) and Coach Aery (speed).

As a parent of a young athlete, you will come across a lot of programs, some better than others depending on what you are looking for as a result. My reasoning for joining and staying with the Grindathon family starts at the top, Coach Billy. He is fully committed to every athlete that comes through his doors. There will not be a day where he doesn't give 100% effort into your athlete, which I feel in return, the athlete gives back. He really establishes a great relationship with the athlete, learns their strengths and weaknesses and works with them on it. This goes with all the coaches with the Grindathon family, Coach Aery and Coach Brandon.

If you are looking for a performance facility, come check them out. Ask your athlete what they think of the program and you'll see what I am talking about.

Thank you Grindathon Family for everything that you do and have done for Rilee. This is the culture you want your athlete in, understanding the goal, and letting the marathon continue.

Source: Google

★ 5

Grindathon has been a game changer for my son. He’s been training here since 2020, and the improvement in his strength, speed, and overall performance has been incredible. The coaches are not only highly trained, professional, and experienced, but genuinely care about the development of each young athlete. If you have kids in sports, I highly recommend checking this place out. You won’t be disappointed

Source: Google

★ 5

My sons have been training with Coach Billy and Grindathon Athletics for years. His knowledge of sports training, as well as the mental side of being a great athlete is unmatched. If you are looking for a team to take your athlete to the next level in all aspects of their sport, Grindathon is the answer!

Source: Google

★ 5

his facility is, without a doubt, one of the best workout environments in the area. Coach Billy and his team do an exceptional job of helping both kids and parents reach their full potential. Once you’re part of a program like this and start seeing real results, it’s hard to imagine training anywhere else. The staff is dedicated to pushing each individual to perform at their best, helping you build not just physical strength but also confidence. It’s truly a place worth being a part of.

Source: Google

★ 5

Grindathon and coach Billy with all his staff are very motivating for my son. When my son started playing travel baseball 2yrs ago coach Billy worked with him with his agility and strength and was a big help. Fast forward to now that my son just turned 10yrs old he wants to play football! We came back to work with Billy and his staff. My son has been sore in a good way, from all his leg muscles and arms. Meaning my son is gaining strength and muscle. Coach Billy I can’t thank you enough for keeping my son motivated and ready to play another sport that he has never played. Semi personal training has been a good start but can’t wait to start personal training to start working with the football in hand. Let’s keep Grinding. GRINDATHON FAM!!

Source: Google

★ 5

My son 1st started training with Grindathon- Billy Thomas in June of 2019. We were looking to build strength gain mobility increase speed agility. As a growing athlete we wanted to make sure we could accomplish these goals in a healthy and safe way. My son also gained a work ethic working with Grindathon that has served him well on the baseball diamond.

Source: Google

★ 5

The best youth trainer! Not only is Coach Billy a trainer he’s a mentor to his athletes. While training my child he took the time to get to know him outside of training, preparing him for the next level.Coach Billy allowed my son who is 14year old be his assistant coach for his flag team on Friday Nights. This help my athlete developed good communication and leadership skills. Grind is the place to be!!!! Thanks Coach

Source: Google

★ 5

My daughter does private lessons with Coach Billy, I seen drastic results within the first month.

Source: Google

★ 5

My son has been working with Coach Billy for about three months now and in those three months, I’ve noticed a big change in my son’s performance on the field, he’s faster he’s quicker. He’s more explosive. His vision down the field has changed his technique and balance are 100% better before he was very uncoordinated and now everything comes a lot easier to him. There’s a lot of trainers out there, but I would never change or go to another trainer Coach Billy is excellent with the kids very inspiring and passionate about what he does not that many trainers give back to there athletes the way he does not to mention the events that he puts up are amazing.

Source: Google

★ 5

Trying to find a kids sports trainer is hard. I was so lucky to find Billy - not only is he affordable for multiple kids but he is the best sports trainer around! My kids skills and confidence improved and upped their physical competative level. Your kids will also be joining a community family, learn life skills and have a mentor that pushes and challenges them! You won’t regret joining the Grindathon family!

Source: Google

★ 5

Best Youth Training Facility!
Coach Billy is great with the kids!
He is always patient with the kids and always keeps them motivated, rain or shine!
You can tell he wants it for them, as much as they want it for themselves!
He is always giving back to the facility and the kids, returning his appreciation constantly.
Coach Aery is awesome with the kids too!
100/10 recommend 🤩

Source: Google

★ 5

Great people, great gym, and great training

Source: Google

★ 5

Great staff my child has learned a lot here. Very thankful. Thank you Coach Aery

Source: Google

★ 5

This program here is a game changer. I brought my daughter in here and I have seen a total transformation. Highly recommend if you want to see your children explore their physical limits.

Source: Google

★ 5

Grindathon has truly been a game-changer for my son. From the moment he joined, it was clear that this is more than just a place to train — it's a community, a family. The level of dedication, expertise, and personal care from Billy and the entire staff is unmatched. They’ve not only helped my son improve his skills and fitness, but they’ve also instilled in him a sense of discipline, confidence, and teamwork that extends far beyond the field.

The workouts are intense, but they’re also structured in a way that builds character and encourages growth. Every session pushes my son to his limits while making sure he enjoys the process. It's evident that Billy and his team genuinely care about each athlete's development, not just physically, but also mentally and emotionally.

What sets Grindathon apart is the genuine camaraderie and family-like atmosphere. It's a place where everyone is cheering for each other, and that positive energy is contagious. My son feels supported, motivated, and inspired to be his best version — on and off the field.

If you're looking for a place that will not only make your child better at sports but also teach them life lessons, Grindathon is the place to be. Billy and the staff are the best, and I can’t recommend this program enough!

Source: Google

★ 5

The experience with Coach Billy , Aery and the entire Grindathon family has been fantastic. All of my boyz ranging from 9yrs old to 17yrs old have had a great experiences with the one on one training and group sessions. So much so that my 9yr old has grown greater and stronger as an athlete and continues to ask to train with Coach Billy along with my 15yr old ..The Grindathon family has been very welcoming, the energy is positive and always Vibing ✨️. I personally have trained with Coach Aery . Her positive attitude and infectious enthusiasm in what she does makes you want more of her sweat dripping workouts.💪 ......I highly recommend Grindathon if you want to take your athlete to the next level.......

Source: Google

★ 5

Taking my son to this facility was the best decision we have made.
I’ve seen tremendous improvement, my son couldn’t be happier, hard work shows in the field.
Thank you Coach Billy!!

Source: Google

★ 5

AMAZING! The best program in the LA area! Coach Billy did an excellent job assembling a fantastic team. Upon entering the facility, you can feel the love and positive energy. I have been working with Coach Billy and Coach Aery, and they transformed my son from an average player who wasn't scoring touchdowns into a standout who now makes them consistently! Additionally, Coach Billy is a well-known trainer, and his posts featuring my son on social media provided him with significant exposure. Thank you, Grindathon!

Source: Google

★ 5

Coach Billy and his team are awesome. My son thoroughly enjoys going to train at Grindathon. Great environment and greater results!

Source: Google

★ 5

Amazing facility. Great Coaches with high energy. Any kids in Youth Sports will find a second home here. My son has for the last 3 years and we are truly blessed having been a part of the Grindathon experience.

Source: Google

★ 5

Grindathon is nothing short of AMAZING. From every coach to the owner. Children are up lifted and cheered on for everything they do. It’s a family/ friendly environment. You go in as strangers and leave as one big family. Very positive energy. Not only is it a work out for kids and adults, coach Billy finds a way to make it fun for everyone. It’s not focused on one sport everyone is welcome. From soccer, to football, baseball, to track and everything in between. If you get the chance go check it out.

Source: Google

★ 5

I’ve been taking my son here for over 2 yrs, and this facility and coaches are one the best places for youth athletes. I recommend Grindathon to all my family, friends and local sports teams in the area. Coach Billy is very approachable and is encouraging with the kids. He truly cares for our youth community.

Source: Google

★ 1

Terrible To exspensive

Source: Google

★ 5

Best youth sports training facility

Source: Google