About Knuckle Up Martial Arts and Fitness

Knuckle Up Martial Arts and Fitness was founded on one belief: martial arts changes lives. It builds stronger bodies, sharper minds, and more confident people — and it does it for everyone, regardless of age, size, or starting point.

Traditional Values, Modern Methods

Our Jacksonville gym brings together the best of both worlds. We honor the traditional values at the heart of the martial arts — discipline, respect, humility, and perseverance — while teaching the modern striking, grappling, and conditioning methods used by today's most effective athletes. The result is training that is both meaningful and genuinely practical.

Skilled, Supportive Instructors

The difference between a workout and real progress is good coaching. Our experienced instructors guide every class, helping you correct your technique, build your confidence, and push past your limits in a safe, structured way. We meet you where you are — complete beginners are not just welcome here, they are our specialty.

A Gym for the Whole Family

We are proud to be a family-friendly facility. Parents and children train under the same roof, and our welcoming, encouraging environment makes martial arts approachable for everyone. Many of our families train together, building healthy habits and shared goals that last a lifetime.

What We Offer

• Kickboxing for fitness, weight loss, and self-defense
• Brazilian Jiu Jitsu for technical ground fighting
• Taekwon Do for striking and discipline
• MMA for the complete combat skill set
• Muay Thai, the art of eight limbs
• Children's programs for ages 3 to 15

Come Train With Us

The best way to understand what makes our gym different is to experience it. Take advantage of our FREE 10-day trial and our no-contract payment options. We are located in Jacksonville, Florida and welcome new students every week. Get in touch to begin.