Fuente: WIPO "rice" An exercise machine comprising a base, a horizontal turntable mounted on the base to rotate about a vertical axis, and two hydraulic assemblies each connecting the turntable to the base. The outboard portions of the hydraulic assemblies are mounted on upstanding base studs affixed to and spaced 2" inwardly from the rim of the base, using adjustable sleeves threadably engaging the outboard distal ends of the pistons of the hydraulic assemblies. The base studs are angled 721/2.degree. to either side of the support affixed to the base. The inboard ends of the hydraulic assemblies are affixed to studs depending from the turntable about 5" radially outwardly from the turntable's rotational axis. The turntable studs are positioned angularly 120.degree. to either side of the center line of the turntable. The resistance against rotation of the turntable increases sinusoidally when the turntable's center line is 471/2.degree. away from the dead center position on the return stroke, and remains substantially constant from about 30.degree. beyond dead center until the end of the outgoing stroke.