12 Moves Celebrity Trainer David Kirsch Says Every Woman Should Do

How to do it: “Lie flat on your back with your arms overhead and a stability ball in your hands. Lift your torso and your hands to meet your legs in the middle; pause and pass the ball so you’re now holding it between your legs. Return to lying flat on your back, this time with the stability ball between your legs. Then lift your torso and legs again to meet and return the ball to your arms. Perform 15 repetitions.