A rehabilitation device for legs has a foot piece mounted on a set of track rails, the foot piece is movable through knee extension and flexion, as well as through an elastic band looped around the back. By moving the foot piece, users are able to redevelop and strengthen muscles in the lower leg. Accompanying the foot piece on the track is a slider. The slider measures the distance the user is able to move the foot piece through a plurality of numbered holes in line with the track.