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Meet Your Coaches

Real Training - Real Coaches - Real Results

Real Training - Real Coaches

Real Results

Known By Name. Pushed With Purpose.

Safe Science-Backed Programming

Certified Professionals With No Ego

Get Coached, Not Just Cheered On

Known By Name.

Pushed With Purpose.

Safe Science-Backed Programming

Certified Professionals With No Ego

Get Coached, Not Just Cheered On

Try A Free Class

Coaches Who Coach - Not Hype You Up

Coaches Who Coach

Not Hype You Up

Our Coaching Philosophy

What Sets GritBox Coaches Apart

At GritBox, every coach earns their spot by bringing the perfect mix of expertise, grit and heart. We're not here to impress you. We’re here to challenge, correct and coach you to become stronger every time you walk through the door.

Every coach is nationally certified and trained
Hands-on coaching every class with no coasting
Program consistency with personal accountability
Workouts for every level without watering it down

The Coaching Team

Coach Marcus “Diesel” Rivera

Marcus is the co-founder of GritBox and a former D1 college athlete with a background in strength & conditioning. Known for his brutal (but fair) programming and deep voice that commands the room, he brings structure and fire to every session. Marcus trains you like you're capable because you are.

"Structure builds strength. Grit builds everything else."

Coach Jess “Jet” Moreno

Jess is the co-founder of GritBox and an ACE-certified trainer with 10+ years of coaching group fitness. Her specialty is motivation that sticks and coaching that lifts. She sees potential and brings it out through smart pacing, great music and high fives that hit hard.

"Don’t chase perfect. Chase progress with purpose."

Coach Troy “Stacks” Hamilton

Troy’s background is in CrossFit and combat sports, giving him a unique mix of explosiveness and endurance. He’s the coach you want when you're stuck because he finds ways to break plateaus and push through.

"Effort beats excuses every time."

Coach Kendra “K.O.” Lee

With a background in dance and performance training, Kendra’s classes are high-energy and insanely well-paced. She coaches with precision and power, keeping intensity high without sacrificing form.

"You already have what it takes. You just forgot how to use it."

What To Expect

Expect full-body workouts that push your strength and test your focus. Each session is structured to create a progressive overload effect, meaning you'll get stronger every week.

Work through structured circuits and build technique under load. Experience how GritBox turns strength training into results-driven progression.

Who It’s For

Made For The Strong-Willed

This class is for people who want more than sweat. They want strength. Total Grit delivers results for every level, whether you're new to the weight room or experienced under the bar.

Members who enjoy structure, pace & progression
Athletes looking to build raw strength & muscle
A strong foundation across all training types
Beginners ready to learn how to lift safely

Benefits Of Class

Strength You Can See & Feel

Total Grit delivers more than muscle. You’ll gain energy, discipline and functional power that shows up in everyday life and every workout.

Train with purpose through structured progression
Increase energy, confidence and total-body power
Build full-body strength through compound lifts
Learn proper lifting form and technique
Gain muscle while improving endurance

Coaching

Strength Coaches With Purpose

Our strength coaches don’t just watch reps, they teach, correct and push you through mental and physical barriers. Every lift is guided, every improvement tracked.