1. Lie on your back and raise your legs and bend your knees so they are bent at a 90-degree angle. Place a stability ball on your thighs and extend both arms up to hold the stability ball in place. 2.
Keeping the back flat, lie supine on the floor, knees up, holding a stability ball between your hands and knees. Extend opposite arm and leg (left leg, right arm and vice versa). Repeat 10 to 12 reps ...