Position seat so shoulders are same height of padded lever. Sit in machine with legs to one side. Place over lever pad. Push padded lever down slightly until shoulder is fixed at approximately 90º; upper arm parallel to floor.
With hips stationary, push down lever by bending to side so elbow points downward. Return and repeat. Position lower body to opposite side and repeat.
Maintain shoulder fixed at approximately 90º so upper arm and upper back are perpendicular. See Spot Reduction Myth.