An exercise device comprises an elastic member with foot straps its ends for attachment to a user's feet, which is secured to a vest which encircles upper chest region, and passes through an inverted "U" enclosed pathway affixed to the vest. Additional elastic members are provided that attach to the first elastic member, and to grasping elements that attach to a user's hands. The additional elastic members preferably connect to the first elastic member, and pass through guide means located at or near the openings of the pathway. Clips or rings are provided on the elastic members that can be used to shorten the length of the elastic members and/or add additional elastic members to the device, and thus modify the tension encountered. In use, the elastic member is put into tension, so that movement of the legs or arms is against the elastic resistance of the elastic member.