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No Excuses - Just Grit
Training With Purpose - Community With Heart
Built in Austin for people who train hard
Structured classes, not guesswork workouts
Coaches who actually coach
A gym that feels like home
Where Hustle Meets Results
Why We Exist
Structure - Sweat - Results
We believe in programming with purpose. Every class follows a rotating weekly cycle focused on real progress, not just burning calories. This is group fitness designed to build discipline, grit and a stronger body every time you show up.
Scientifically backed programming
Small classes for real coaching
No fluff, no mirrors, no shortcuts
Music that hits hard and motivates harder
Trusted For 20 Years
Call 361-992-5621 Today!
The GritBox Origin Story
Started With Sweat. Built With Purpose.
GritBox was born in Austin when two fitness pros saw the gap between overpriced boutique studios and impersonal warehouse gyms. Jess and Marcus Rivera launched a 6:00 AM outdoor bootcamp with 8 people, 2 kettlebells and a Bluetooth speaker. It wasn’t fancy, but it was focused.
People kept coming back, not for selfies, but for real results. As that gritty morning crew grew, so did the vision. In 2022, GritBox Training Co. opened its doors with one goal: to be the last gym you’ll ever need.
Meet Jess & Marcus
Jess Rivera
A former Division I soccer player with a background in sports science and group program design. She specializes in progressive strength training and bringing structure to every workout.
Marcus Rivera
A U.S. Marine veteran turned certified strength coach. Known for tough love, team energy and turning doubters into doers. He brings discipline and heart to every class.
Jess and Marcus Rivera built GritBox to reflect what they believe in: real training, real community and no wasted time. Together, they coach most of the classes, know every member by name and never phone it in.
Our Core Values
Grit Over Glam
Show up sweaty, not stylish.
Structure Over Chaos
Every workout has a purpose.
No One Left Behind
Modify It. Rep It. Crush It.
Starts At Zero
Leave your ego at the door.
Earn Your Energy
Don’t fake motivation. Train for it.
Who We Train
Members are working professionals, entrepreneurs and creatives in Austin who want real training without the ego. If you’re tired of figuring it out alone or being ignored in overcrowded classes, you’ll feel at home here.
All fitness levels welcome
New to fitness? We got you.
Structured workouts for busy schedules
Seasoned athletes? We’ll push you harder.
Clear progression & supportive coaching
Come as you are - leave better every time
🎁 Ready To Get After It?
GritBox isn’t for the casually curious. It’s for the focused, the fired-up and the ready. If you want structure, sweat and community without the BS, we’ve got a spot for you.
Try your first class free
Meet real coaches who coach
Experience structured workouts with grit
See if it’s the right fit — no pressure
GritBox offers a free class with no sales pitches. Show up and meet the crew. See what we’re about.
Call 361-992-5621 Today!
No Ego - No Excuses - Just Results
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