Bulletproof your body.
Win more matches.
Dominate the competition.

BOOK YOUR STRATEGY SESSION
“My mission in life is to help grapplers stay on the mats longer, win more matches, and get injured less. ”

Founder, Grappling Strength & Performance

Hi! I’m Matt Guffey –

For the past 18+ years, I’ve been devoted to helping others through personal strength training. I started coaching AAA hockey for the San Jose Sharks in 2015. And in 2020, I opened my own strength training gym, Grappling Strength & Performance, in San Jose, California.

My team and I at GSP are dedicated to changing people’s lives through individualized strength and mobility programs. Our gym has quadrupled in size since we first opened, and I was voted Business Owner of the Year by Results Fitness University in 2022!

Now for the alphabet soup: I’m a Certified Strength and Conditioning Specialist (NSCA), Certified Functional Range Mobility Specialist (FRC), Certified Functional Strength Coach (CFSC), and earned my brown belt under 12x World Champion Professor Caio Terra.

I specialize in working with grapplers of all sizes, ages, and skill levels.

If that’s what you want, book your strategy session at Grappling Strength & Performance today.

See you in the gym!

Matt Guffey

Meet the Team

  • Brendan Tydingco

    Brendan is a Certified Functional Strength Coach (CFSC), Certified Personal Trainer (NASM) and fourth year Public Health major at San Jose State University. He grew up playing hockey for the Santa Clara Blackhawks and San Jose Junior Sharks.

    Brendan is hands down the best at cultivating a vibe in the gym (ask him about all things music) and is constantly on the lookout for the best spots to eat in the Bay Area. His ability to learn quickly and create deep bonds with the athletes he coaches make him a valuable asset to the GSP team!

  • Serena Acosta

    SERENA ACOSTA

    Serena is a blue belt in Brazilian Jiu-Jitsu and San Jose State University graduate with a bachelor’s degree in Kinesiology. Her coaching and movement instruction experience include three years of teaching dance and nearly two years assisting youth BJJ classes. Serena is both a Coach and Administrative Assistant at GSP.

    Serena danced for 15 years and then transitioned to BJJ for the last 3 years. She enjoys training, reading, raving, and spending time with friends and family. 

  • Kelly Gee

    Kelly is a strategy session coordinator here at GSP. She graduated with a Bachelor’s in Public Policy from University of California, Riverside. Her hobbies include drawing, crocheting, trying new restaurants, and baking sweets for everyone to try!

  • John Relleve

    JOHN RELLEVE

    John is a San Jose State University graduate with a bachelor's degree in Kinesiology, specializing in Exercise & Fitness. He is also a U.S. Army veteran, having served as an airborne infantryman. John has a passion for strength training and is eager to share that passion with everyone at GSP.

    John is a BJJ white belt who loves stand up and attacks from front headlock, especially D'Arce chokes. Tell him about your jiu-jitsu A-game ✅

    John is also an avid fighting game player, maining Ed in Street Fighter 6 and Reina in Tekken 8. He's up for a challenge any time!