A.K.A. Exercise Ball Cable Flye
START: This exercise is similar in execution to the flat-bench flye, except that here your body works harder to keep you stabilized. Grab two dumbbells and lie back on a ball so that you face the ceiling. Your feet should be firmly planted on the floor about shoulder- width apart. Begin holding the dumbbells with your arms straight up from your shoulders, and the weights directly over your chest. Your palms should face each other and your elbows should be slightly bent. This angle of your elbows should be maintained throughout the entire exercise.
MOVE: Slowly lower your arms out to your sides until your wrists come to about shoulder level or slightly above. Bring your arms back toward the midline of your body, focusing on using your pec muscles to draw them back together.