What is Adaptive Resistance Exercise (ARX)?

Adaptive resistance exercise with ARX is what allows us to provide you with the most effective workout of your life in as little as 10 minutes a week.

ARX technology combines 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.

It is the first technology created that perfectly accommodates any user’s force output and measure it repeatably and accurately throughout the entire range of motion. Throw in some tracking software for motivation, while quantifying all of the important metrics, and you have ARX - the next generation in exercise equipment!

fans of arx

Adaptive Resistance with ARX is the Most Effective and Efficient Way to Exercise

By utilizing a motorized drive system, ARX equipment delivers perfectly-matched resistance 100% of the time. Unlike metal weights that fail to accommodate your changing levels of strength, the resistance provided by ARX can never be excessive or inadequate.

adaptive resistance (arx)

Instead of using weights as a means of resistance, ARX uses finely-tuned motors to provide what is called “adaptive resistance;” resistance applied to the user only in response to their own effort. Physical effort against resistance is the first step or “active ingredient” in all exercise, and its downstream effects give us all the health benefits we know and love from training. ARX provides safe, controlled, immediate, infinite, and quantifiable resistance that is of a higher quality than is currently possible with the out-dated, gravity-based systems found in gyms worldwide.


Using ARX once or twice a week for 10 minutes stimulates all of the muscle growth I need. I know that sounds ridiculous, but it works! 

dave asprey

Dave Asprey

Founder and CEO of Bulletproof


If you're an entrepreneur committed to optimizing your physiology, ARX must be in your routine. The amount of time and energy you save using ARX is a no-brainer. 

alex charfen

Alex Charfen

Author of The Entrepreneur Personality Type


ARX is an awesome technology that can get you maximally strong in a very, very short period of time. 

ben greenfield

Ben Greenfield

Triathlete and CEO of Greenfield Fitness Systems

  • Tony Volak


    the ARX system appears to be a combination of “super slow” exercise and “isokinetic” exercise, in effect super slow isokinetics. Is this not a contradiction to all the studies which seem to indicate that isokinetic exercise should be done at faster speeds for best results?

    • Josh


      I can comment on our experience, and we’ve experimented with different speeds over the last couple years, but a 5 second travel time in both directions (sometimes we’ll do a 7-second negative) has worked incredibly well.

  • Hall Trice


    I’ve emphasized my negatives or downward motion for years with at least a 20 count… This would be sooooo much better!!! Free Samples!!?? (-:

  • Christina Ledo


    I have done it, former bodybuilder, trainer of 8 years, cscs certified and I use sports performance techniques of all types…this was a new sore. The resistance isn’t one you can get from anything else. It challenges the muscle in the eccentric and concentric motion of each movement.

  • Roderick Reilly


    How is this different from variable resistance?

    • Josh


      ARX matches each user perfectly at every point along the range-of-motion (positive and negative) using motorized resistance and sophisticated software. No gravity or weights to drop – if you stop it stops. As you progress through the exercise the machines adapt and allow you to reach a deep level of fatigue in a couple of minutes, recruiting muscle fibers in reverse of other methods – fast then slow. It would take multiple sets, even with variable resistance, to achieve anywhere close to the same level of fatigue that you can reach in a couple of minutes with ARX, and impossible to reach the same levels of force that can be produced on the negatives where everyone is significantly stronger.

      If you’re in Nashville we’d love for you to come try it out and see what you think!

  • >