Abstract: A device for exercising the calf muscles of a user including a frame formed of a base and two substantially parallel diagonal beams extending from either side of the base forming an acute angle with the base. A pad, contoured for accommodating a front side of at least one of the user's thighs is connected between the diagonal beams and extends at an angle adjustable within an obtuse angle supplementary with the acute angle. A weight bar is movable along the length of both diagonal beams and is releasably held at a plurality of different heights above the base. The machine is operable between a first secured mode securing the weight bar at a desired one of the plurality of different heights and a second released mode releasing the weight bar from its secured position.