a muscle - stretching machine designed to provide the user with an easy method of functional and dynamic stretching and also provide the user with flexibility feedback information as to the performance of the stretch , with regards to the included angle between the two legs . a user of the muscle stretching machine can set the roller pad along any point along the back of the user &# 39 ; s leg and set the angle the roller pad makes with the floor , so that the angle exceeds the users stride length . the user then lies on their back on the cushioned surface ; places one leg on the roller pad and the other leg is allowed to hang down . if the roller pad is set at an angle that exceeds the users stride length , then the leg not on the pad will not contact the floor . as a result , when the free leg drops all the muscles in the user &# 39 ; s stride are stretched .