About Theorem

Built by someone who spent 25+ years solving the problem you're dealing with right now.

Dominick Nusdeu, Certified Muscle System Specialist

Dominick Nusdeu

Certified Muscle System Specialist • Resistance Training Specialist • 4th-Degree Brazilian Jiu Jitsu Black Belt

Dominick Nusdeu has over 25 years of experience in pain-free strength training and performance. He holds a degree in Exercise Science with minors in Nutrition and Public Health from Southern Connecticut State University, and has completed over 2,000 hours of advanced coursework in biomechanics, neuroscience, and muscle function.

As a former Director of the National Personal Training Institute, Dominick has trained hundreds of fitness professionals in biomechanics, anatomy, and exercise prescription. He was one of only 14 global instructors and 85 Master Specialists in Muscle Activation Techniques worldwide.

Education & Certifications

  • B.S. Exercise Science — Southern Connecticut State University
  • Minors in Nutrition & Public Health
  • Certified Muscle System Specialist
  • Resistance Training Specialist
  • 2,000+ hours advanced coursework in biomechanics & neuroscience
  • One of 14 global instructors in Muscle Activation Techniques
  • 85 Master Specialists in MAT worldwide

Jiu Jitsu Credentials

  • 4th-Degree Brazilian Jiu Jitsu Black Belt
  • 15× NAGA Champion
  • 2× Grapplers Quest Champion
  • 2× AGC Team Champion
  • Instructor — Decision Making 101: From the Table to the Floor
  • Content creator for BJJ Fanatics

Organizations Founded

  • Theorem Fitness & Jiu Jitsu Club
  • MotionMechanix
  • MMX Exercise Education Academy
  • Jiu Jitsu Intelligence
Dominick Nusdeu certifications

Not a bootcamp. Not group fitness.
Not a gym.

Theorem was built because the fitness industry failed adults over 40. Programs designed for 25-year-olds. Cookie-cutter plans that ignore your joints. High-impact classes where nobody knows your history. Six-week "transformations" that fall apart by week eight.

Dominick built Theorem to be exactly the opposite: private, personalized, science-based, and built for the long haul. Every session starts with your structure, your pain history, and your goals. Every plan is designed to be something you can actually sustain — not just survive.

The result is a small, appointment-only training environment where every client gets the same specialist every time, a plan that evolves with them, and results that last.

Theorem training session

Ready to Work With Dominick?

Book a free 10-minute call to see if Theorem is the right fit for where you are right now.

Book Your Free 10-Minute Call

By appointment only · Adults 40+ · Bonita Springs / North Naples, FL