-Lie on the ball, positioning it under the lower back. -Cross your arms over the chest or place them behind your head. -Contract your abs to lift your torso off the ball, pulling the bottom of your ribcage down toward your hips. -As you curl up, keep the ball stable (i.e., the ball shouldn't roll). -Lower back down, getting a stretch in the abs, and repeat for 1-3 sets of 12-16 reps.
-Do not do the exercises unless advised by your doctor. -Repetitions of each exercise depend on your tolerance and condition, usually between 30-50 times. -If you feel any pain while doing the exercises stop and ask your doctor.