A.K.A. One Leg Prone Cobras on Ball With Band One Arm
Laying flat on a stability ball, lift one foot off the floor after you attach the band to the lower part of the door or pole. Make sure the band has some tension and that there is no slack. Outstretch your arm over your head holding the band with your hands. This will seem strainful, but that is the point. Keeping your chest and your arm from touching the ground throughout the exercise, start moving your arms to your side (like a jumping jack on the ground with just your arm) Slowly come back to the starting position without touching the ground and repeat. This exercise is SUPER SETTED with another back exercise!