A plantar exercise device for therapeutic foot exercises is formed of a generally planar base board and a beam or block member firmly secured upon the base board and positioned transversely across the base board. The beam is positioned closer to one end of the base board than the other, so that the different stretch heights are presented on the two sides. Additional blocks may be present to provide additional stretch height. A non slip coating may be applied at least onto the upper surfaces of the beam and base board.