This exercise requires good balance on the stability ball.
Roll a stability ball into the middle of a gymnastics mat. Lay over the ball with your stomach on the ball and your hands shoulder width apart on the floor. Roll over the ball & walk your hands out until the ball is under your thighs and your shoulders are directly over your hands.
Now slowly bend your arms, just like regular push-ups, and hold for about 2-5 seconds. Return to the starting position and repeat 8-12 times.