Place the ball in front of a stirrup handle attached to the low pulley. Position yourself sideways to the weight stack and lie on the ball, getting into either the flat position pictured on the opposite page, or the incline or decline variations just described. Grab the handle with your inside hand, and hold your outside thigh with your outside had for stability. Then do a standard cable fly with your working are, taking care not to turn on the ball to help get the weight moving.