“Doing crunches on the ball keeps you unbalanced, so your core has to do extra work to stabilize the body,” says Smith, who offers wellness tips on her podcast On Health: The Art of Living. This allows you to get deeper toning in the rectus and transverse abdominis muscles, which work to tuck in a lower-belly bulge.
TO DO: Lie with your back on the ball and your feet flat on the floor. Cross your arms over your chest, then crunch your upper body up toward your knees. Hold for one breath; return to start. Do 15 reps.