Exercise & strengthen muscles in the upper & lower body to build strength, increase motion and improve conditioning Large soft grip handles are easy to slip over feet & ankles to deliver an effective lower body workout ideal for conditioning & rehabbing muscles Color-coded Progressive Resistance system allows users to recognize improvement as it happens, as you grow stronger you can move up to the next color Rehabilitate muscles through simple yet effective workouts to increase strength & improve motion Medium Red Tubes are the third of eight levels of resistance and great for rehabilitation and light resistance exercise, they offer 3.7 lbs. resistance and 25% increase from preceding color at 100% elongation, and 5.5 lbs. at 200%