
ARX adaptive resistance
ARX is a precisely controlled, low-impact way to build strength and support bone health. It meets you at a comfortable starting point, then can scale to the kind of intense, measurable challenge professional athletes value.

Keiser pneumatic technology


- Built for professional athletes, even better suited for the average 50-year-old and clients requiring adaptive training techniques.
- Train at the speed life requires.
- Build strength, power and reaction speed without the jolt of conventional weights.
- Start gently and adjust resistance in precise increments.
- Practice moving with confidence, whether your goal is getting out of a chair, catching yourself on uneven ground, or keeping up with the life you love.
A private studio, not a crowded gym
Fit-Rx gives adults 50+ a calm, guided place to train in Fort Collins. There is no pressure to keep up with a class, figure out unfamiliar equipment or squeeze into a noisy weight room. Every session has a clear purpose, a coach nearby and room to focus on the movement that matters to you.
Equipment that meets you where you are
Specialized resistance equipment lets Fit-Rx adjust the challenge in small, useful steps. That matters when you are returning after time away, working around joint concerns or ready to train with more intent. The goal is not to make every session feel hard. It is to make each session productive, controlled and worth repeating.
Built for life outside the studio
The best equipment is only useful when it helps you do more beyond the workout. Training can support a stronger rise from a chair, steadier footing on uneven ground, more confidence on stairs and the power to react when life moves quickly. Fit-Rx builds those abilities around the life you want to keep living.
