Grab a pair of dumbbells that are lighter than those you'd use for the standard bench version. Lie so that only your head, neck, and shoulder blades are in contact with the ball-your lower back should be off it. With your fee shoulder-width apart, push t lift your hips until they're parallel t the floor and your knees are bent at a 90 degree angle. Then simply press the weights up over your chest as in the standard bench press.