A wonderful academy that's spacious and well maintained. Head Instructor David is very…read moreknowledgeable and teaches with patience and expertise. I try to show up when I can to get his advice on bettering my all around Jiu Jitsu game. Coach Samantha is always very professional, nice and very proactive in making sure everyone is included. She is also very knowledgeable in her own right, with great coaching skills. Sparring with the both of them Is very fun, challenging and informative. I definitely recommend Big Break Jiu Jitsu for beginners and advanced level jiu jitsu practitioners. It is a great gym for everyone in the family.

Have been taking classes for a year at Big Break. Instruction is great. All of the students have…read morea good attitude and are very helpful especially to beginers. There are classes for all ages and all genders.

This is a family owned business with an amazing love for what they do. Their business is their…read morefamily and they put their heart into their students completely. This is one of the best privately owned dojos I have encountered. They're the best!

We love coming here. Lots of fun and tons of important learning going on. Our daughter is new and…read moreshe loves it already. Normally shy and now is blossoming into a fierce little warrior.

Training with Professor Pedro is like getting a masterclass in the history and application of BJJ…read more I love hearing about his stories of training BJJ back in Brazil. He often shares great stories from the early days of BJJ that really put the journey into perspective. I've been learning from him since October 2025 and his classes are consistently top-notch. He provides a very well-rounded curriculum, covering everything from stand-up takedowns to finishing details for the cross collar choke. What I appreciate most is how he simplifies complex positions - he'll show you a transition or a sweep gives that 'aha' moment because it's so efficient not just on the sweep itself, but also on possible attacks within the sweep. He's a professional, approachable instructor who makes even the most uncomfortable (knee on belly, osoto gari, etc) techniques easy to understand and apply.

We have been coming to GMC for over a year now, since they opened this location and we just LOVE…read moreit. Our daughter is 6 and she was hesitant to start Jiu Jitsu but the moment she stepped foot on the mat, coach Mark and Coach Sabrina made her so comfortable. Alongside all the kids and families we have met along the way. Walking in, there's always a warm welcome from the coaches and you can tell that not only do they LOVE what they do but they LOVE being there. It's an amazing community and we hope to continue to stay as long as our little one is enjoying it. Thank you Mark and Sabrina for such a great experience every week for over a year!

Growth Mindset is hands down the best jiu-jitsu gym I've ever trained at bar none…read more I've been training for seven years and have trained at a lot of different gyms during that time. Every gym says they're a family, every gym says they care about their students, but Growth Mindset is the first place where I truly felt that was real. The difference starts with Mark. What sets him apart isn't just his knowledge of jiu-jitsu--it's the genuine care he has for every single person who walks through those doors. There is no hierarchy, no ego, no favorites. Whether it's your first class or you've been training for years, he treats everyone with the same respect and invests in everyone equally. I remember after one of my very first classes, I stayed talking with Mark and a few of the members for over an hour and a half. It wasn't small talk--it was one of the most genuine conversations I'd had in a long time. I left that night knowing I didn't want to settle for training anywhere else. Around the time I signed up, I had just been laid off from my job. I was stressed out of my mind wondering how I was going to pay my bills and what my next step in life was going to be. Looking back, the one thing that kept me grounded during that time was walking through the doors of Growth Mindset. No matter how bad my day had been, the moment I stepped on those mats I felt like I was home. I wasn't just another membership I was family. That first month I was also preparing for a HYROX competition, so I could only make it to class three times out of the whole month. Most gyms would've just said, "That's on you." Instead, Mark prorated my membership and credited me toward the following month. He didn't have to do that. There was no policy requiring it. He simply did it because he genuinely cares about people. That small act told me everything I needed to know about the kind of man he is. The culture he's built is something that's incredibly rare these days, there is absolutely zero ego. Mark is always asking for feedback from the students. He wants to know what we're feeling, what makes sense, and what doesn't. He's humble enough to know that coaching is about helping people learn, not about proving he's the smartest person in the room. When I was preparing for my most recent competition, Mark did something no coach had ever done for me before. He sat down with me and watched footage from my previous tournaments. We broke down every mistake I made, why it happened, how to prevent it, and even developed techniques that better fit my style of jiu-jitsu. Every other gym I've trained at would've simply told me, "Train harder." Mark actually taught me how to get better. I ended up placing fourth in that competition. Instead of focusing on the fact that I didn't win a medal, Mark immediately pointed out how much I had improved. He celebrated the things I'd done well, highlighted the progress I'd made, and gave me a clear plan to keep growing. That's what great coaching looks like. The amount of work this man puts in is unbelievable. While preparing me for my tournament, he was also coaching another teammate for his competition, hard sparring almost every day, organizing cross-training sessions at other gyms, and somehow still preparing for his own tournament. I've never seen someone work that hard, day after day, without complaining once. Even while training harder than 99% of instructors out there, he stays humble. He'll still remind us that he's human, still learning, and still growing right alongside us. That humility is what makes him so special. Mark and Sabrina have built something truly exceptional. They've created more than a gym they've built a community where people genuinely care about one another. I can honestly say this gym helped carry me through one of the hardest periods of my life, and I'll never forget that. I hope one day I can be half the man Mark is. I'm incredibly proud to call him not only my coach, but also family. Thank you, Mark and Sabrina, for everything you've done for me and for this community. What you've built is something truly special. Love you guys!

Great school! Great coaches! Great family atmosphere! My son has loved it from day 1 and tells me…read morehis goal is to get his black belt! He's in first grade! I just love the fact that he's found a sport he truly loves! 2 tournaments so far and he can't wait for the next 1.

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I got my black belt from here. The best place in the East Bay! They are the nicest family and are…read moreextremely professional. Behind their caring attitude are constructive teachers that can push you to be your best if you want to be! Sifu Tim has many years of experience and training that will make you feel like you're in the right hands. He understands the real world, and knows how practical self defense is the most effective personal safety measure. I highly recommend this place to anyone looking for quality self defense training.

My son Ty , 13 yrs old, tried his first class at D-1 yesterday and I was impressed. Not…read moreintimidating at all . All instructors were able to cue in on my son's challanges and help him move forward without embarassing him or making him feel inferior. Even though others were present instructors took the time to show him the correct way without singling him out. This was impressive to me because many times students get lost in numbers. Another element that stood out was respect. Not just at a martial arts level, but truely sincere level of respect towards others. Great first impression!

He's back!!!! I originally started my daughter at the age of 4 at Delta One with Sifu Tim, when he…read morehad his school here 6 years ago. He is such an outstanding role model and mentor, along with his staff, I continued to take my daughter to the original location in Antioch, when the Discovery Bay location closed. I also enrolled my son when he was old enough. Thank you Sifu Tim for all you do!

I feel so lucky that this place is here in Discovery Bay. I love it! The Calvin's are amazing and…read moreSifu Tim and Sifu Isaiah are awesome instructors. I am at awe when I watch them with children. They really understand them and the kids are all smiles when they are there. I started a month ago and it is already changing my life. They really break down the combinations we learn during class so you can understand them. I can't wait to go and feel great when I leave. The students there all work well together. We all have different goals and Sifu Tim helps us all accomplish them. I know it would be very difficult to find another place like this. It doesn't matter if you're a man, woman or child you will love this school and most importantly, learn how to defend yourself!

This is the best place I learned Martial Arts. I'm a student here, I've been training for almost 10…read moreyears. I would recommend this place as the best way to learn Martial Arts!

I first heard about this dojo through several people I knew, music students of mine, who turned out…read moreto be black belts. They were all respectful, humble, and high-achieving young men. I knew that the dojo they trained at must be doing something right. Now, my kids and I train here as well. A great martial arts school with qualified, friendly, and serious instructors. Highly recommended for beginners and those who want to get serious about karate. They also have Zumba and other classes.