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.

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.

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.

My girls take Jiu Jitsu lessons with Mark. They love it and we love the small class size. My eldest…read moregets overwhelmed easily. Not a problem in Marks class. My girls come home showing us everything they've learned and telling us all about it. They love it. If your looking at putting your kids in self defense or homeschool look no further. Mark and Sabrina are great at what they do. Very nice and prompt in responding to any questions. They are the best.

It's been just over a month since my son joined GMC, and I've never seen him so excited about a…read moreclass. We've tried many sports in the past, but nothing ever truly stuck, until now. Coach Mark does an incredible job balancing discipline and respect while still keeping the atmosphere fun and engaging. Both Coach Mark and Coach Sabrina are fantastic, and we're so grateful for the impact they've had on our son.

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 highly recommend this place to anyone who wants to learn true martial arts. I have known the…read moreowners for several years and they are kind wonderful caring people who care about teaching anyone and everyone self defense. I was once a student my self years ago and both owners were encouraging and both were very helpful to me. The owners truly care about their students being successful in not just martial arts but in life and they help you to do the best that you can and they show you and guide you to your full potential. They also help you feel confident about yourself and help you reach all of your goals. They are so proud of their students achievements and it's like a family as well. I am so glad that they are successful and hope they are successful for many more years to come.