About Us

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CoCo CrossFit is part of the ever-growing Touchsctone Climbing community. We are part of Diablo Rock Gym in Concord, CA. A Touchstone membership means you have access to CrossFit!

At CoCo CrossFit, we help you attain elite fitness through a constant upgrade of your abilities. We use functional movements (pushing, pulling, squatting, running, jumping) in constantly varied combinations at high intensity. We incorporate elements from our years of team sports, the various CrossFit disciplines, our unlimited access to a rock climbing facility, our perspective from participating and coaching in competitive athletics and our decade of experience with CrossFit to help our members leverage their strengths and uncover untapped potential. Because our workouts are constantly varied, you won't get bored doing the same routines day after day.  

CrossFit is fitness for everyone. Our athletes include people recovering from injuries, folks who’ve never worked out before, as well as recreational and Division-1 athletes; all working out together and learning from each other. No matter your skill level, we would love to introduce you to CoCo CrossFit and get you in the best shape of your life…and you’ll look like it too! 



1220 Diamond Way STE 140
Concord, CA 94520

Diablo Rock Gym Hours (Class Schedule Here)

5:30am – 10pm Weekdays
9am – 6pm Weekends


Our Trainers


Brynn Brothers

CF-L2 | Owner | Trainer | Designer

Doron convinced me to try CrossFit in 2013 and I haven't stopped since. He had tried to get me to a class for months, but I was far too intimidated and decided my daily 3 mile run was where my fitness life existed. Now I can't imagine going back. CrossFit has encouraged me to push myself physically and mentaly. Watching my progress through strength training and gymnastic movements keeps me coming back for more. I love sharing that experience with others and helping them achieve their fitness goals.

When I'm not at the gym I'm outside adventuring and camping whether it's at the beach or in the mountains. When I'm forced to be inside I'm doing all sorts of graphic design projects.

Contact Brynn at brynnbrothers@gmail.com


Cristofer Ochoa

CF-L2 | Owner | Trainer

I was Born and raised within the 46.7 square mile grid of San Francisco. I competitively fought in the sport of Muay Thai from the age of 11 years old right up until I started CrossFit in 2012. I took an interest in CrossFit before I started my Fire Academy. I hadn't lifted a barbell in my life. I wanted to implement strength into my regimen. I got hooked and haven't looked back since.

Out on the black mats, under the extreme weather conditions, you will find me encouraging our fellow athletes. I feel that CrossFit not only develops strength and conditioning, but it builds character, confidence, and mental fortitude. Better yourself. Do hard things.

Also, I like ice cream; Rocky Road ice cream.

Contact Cris at cristoferochoa@gmail.com


Doron Serban

CF-L1 | Co-Founder | Trainer

I founded CoCo CrossFit in 2012 with my twin brother, Shaul, after 11 years of CrossFitting. I did it on my own for 7 years, then at CrossFit East Bay for the past 4 years, including 3 years as an instructor. I grew up in Israel, Europe and the US, competing in tennis, baseball, soccer, and diving. While teaching Judo and Jujitsu in college (2001), I heard about CrossFit. In 2008, I stumbled onto CrossFit East Bay and joined that same day. After seven years of CrossFitting and two more years of training and helping out at CFEB, I got certified.

When I'm not at the gym, I am an architect and the BFA Emergent Design Coordinator for the School of Architecture at the Academy of Art University. Teaching is my life. I love to expose people to things they never thought were possible. My own struggles with my lack of flexibility taught me the importance of developing strengths from multiple angles. I had to be patient with my body and to accept progress at my own pace. I find that videotaping and photographing my workouts and techniques make a huge difference in helping me understand where I am being less efficient, and I now use video regularly with everyone I train. I obsess about making sure our athletes perform movements with an understanding of how their bodies function. You cannot optimize performance when you're stuck in 1st gear. Being (overly) analytical, I'm constantly on the lookout for new systems that will propel our members past a sticking point.

Contact Doron at doronserban@gmail.com


Shaul Serban

CF-L2 | CF Endurance | Co-Founder | Trainer

My CrossFit life began in 2009. My first official workout was 100 reverse burpees for time and I got a big, fat Did Not Finish. But I kept coming back until eventually my Box was my second home. In my other life, I am a lawyer.

I want my athletes to enjoy working out. I make too many jokes and try to keep people at ease. If you are shy, I will bring out your hidden confidence; whether you want me to or not. I like programming WOD’s that scare you when you read them, frustrate you as you do them, and satisfy you after you finish. My goal is to make you want to come to class so you can be strong and limber, the way nature intended you to be.

Contact Shaul at shaulserban@gmail.com


Alex Perec

USAW Sports Performance Coach | Trainer | Olympic Lifting Coach

Born and raised in Rochester, NY I played pretty much any sport my parents would let me, including gymnastics, snowboarding, soccer, basketball and cross training with weights. I attended college at the State University of NY in Geneseo, NY where I graduated with a Bachelor in Computer Science and a Minor in Mathematics. After college I did jujitsu and muay thai for several years as another way to tax my fitness.

After moving to California in 2012, I joined a CrossFit Box about a month before the CrossFit Open and was feeling fairly confident going into the first week of the Open. That feeling was short lived though as I suddenly discovered huge gaping holes in my fitness; why are my lungs about to explode?! Never one to accept defeat though, I immediately decided that I was going to work my butt off till I could perform all the skills to my greatest potential. This quickly led to obtaining specialized coaching in the Olympic lifts and then hanging out after class to work on skills and share the things I was learning with others. Eventually this evolved into running classes and coaching regularly.

As a coach I always want to push people to their best. I love cheering with my athletes when they crush a PR (personal record) or just survive a particularly brutal workout. I love seeing how happy people get when they conquer their fears and accomplish something they didn’t even know they were capable of. Most of all I love hearing how CrossFit has enriched people’s lives outside of the gym. With gained confidence and enhanced mobility, it allows them to excel in activities that might not have been possible or as fun before.

Contact Alex at azenalex@gmail.com


Jason Padiernos

CF-L1 | Trainer

I've been doing Crossfit now for the past 4+yrs. It has redefined the definition of fitness for me. I enjoy how it challenges you not only physically but more so mentally. The support community that goes along with Crossfit comes second to none. I've built long lasting relationships through functional fitness which I utilize in my everyday life.

When I'm not in the gym; I enjoy spending time with my family and my son. Traveling to experience different cultures, backpacking to remote places, and eating delicious foods! I've done the "Mt. Everest of Kayaking" twice in my lifetime so you can say that my primary goal with Crossfit is to improve my overall health so I can experience some of these amazing once in a lifetime experiences.

contact Jay at jaypadiernos@yahoo.com


Alec Silva

CF-L1 | Trainer

I started doing CrossFit in 2014. My parents actually got me to join this box after I finished playing football in high school. CrossFit and the community that comes with it has helped me break out of my shell and push myself both physically and mentally. I have been able to do things that I never could have imagined such as simply doing 1 pull up to doing handstands on a wall for long periods of time. The most important thing I have learned is that you can do anything you set your mind to and that “impossible” is just a word.

As a trainer and a member of this wonderful community, my goal is to help you achieve your goals wholeheartedly in every way I can. If you’re new to CrossFit and wonder what it is all about, stop by our gym and I would be honored to show you.

Contact Alec at alec.silva19@yahoo.com