Exercise & strengthen muscles in the upper & lower body to build strength, increase motion and improve conditioning. Improves strength, range of motion and flexibility in a simple to use, portable product that works in the clinic, the gym, at home or on the road. 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. Light set includes second, third and fourth of eight levels of Latex Resistance Tubes, Yellow, 100%, 3.0 lbs., 200%, 4.3lbs, Red, 100%, 3.7 lbs., 200% 4.3%, Green, 100%, 4.6 lbs., 200%, 5.5 lbs.