• Defy Fitness Napa Valley California Logo

    Everything you know about fitness is about to change! (in a really good way)

    Amazing results! Ultra efficient workouts!

    Looking for a new gym?

    Defy fitness is Napa's only ARX smart gym. We offer motorized resistance for weight loss, body sculpting and bone density. Body building and lean muscle gain.


    ARX technology uses computer-controlled, motorized resistance that is capable of matching the force of any user 100% of the time. This gives you the perfect rep, every rep. With perfect resistance, ARX shortens the time you need to exercise while dramatically increasing the safety and effectiveness of all of your workouts.


    Want to lose weight? Want to become ridiculously stronger? Need to build new muscle or increase bone density? Thinking about joining a gym or health club and thinking "who even has time for that?" Then ARX will be a perfect fit for you! The days of spending countless hours per week in the gym waiting on equipment, being stared at or ogled, and getting mediocre results from mediocre exercises are over! The future of fitness is ARX and it is available right now! Right here! In Napa!


    ARX can benefit everyone from senior citizens to busy executives. Just what the doctor ordered! That's right, ARX is a rehabilitation tool! Because ARX measures everything, bio-hackers and athletes of all kinds can geek out on the massive amounts of data never available until now. ARX will improve your body more efficiently and we can prove it!

  • What is adaptive resistance exercise?

    Click on the video links to learn more. Free demo sessions available, hit the "Free Trial Click Here" button.

  • Tutorials

    Demonstration videos of the exercises that can be performed.

  • Napa's 1st Fit 3D scanner

    Yet another way to prove the effectiveness of ARX. Free for members to use. Packages available for purchase.

    Fit 3D scanner for complete tracking of body composition changes

    For best results please bring proper scanning attire as shown.

  • Defy fitness Napa valley - By definition it is what we do!