Abstract: An exercise device for working both the arms and legs simultaneously when desired, as when a boxer shadow boxes during road work, includes a wheeled frame arranged as a trailer. Elastic straps stretched from the frame engaging the legs just above the knees and a pair of elastic straps grasped by the hands are worked in running and punching motions. The reaction from the elastic stretching is passed via an articulated abutment on the frame to the user's upper legs. In another form, a cushioned abutment is coupled to the user by a waist belt assembly.