This incredible machine is highly effective for strenghtening, toning and stretching all body types. It is also excellent for rehabilitation for people with back, neck, knee and foot injuries. There are a series of exercises one can do laying down in a comfortable, nonweight-bearing position so the back and neck are supported. Tension springs are adjustable to form different levels of resistance while you glide through a series of exercises, similar to the resistance of wading through water. You will find that you are engaging muscles that you may seldom use. The exercises are relaxing with no straining and the results are long, lean, toned muscles.