Who doesn't want a bare-able belly? Aside from the obvious aesthetic benefits of enviable abdominals (read: bathing—and birthday—suit confidence), toned stomach muscles also support your entire torso. "Having a strong midsection means you'll put less strain on your lower back and gain better posture," says Chicago-based trainer CC Cunningham, a spokesperson for the American Council on Exercise. Try these exercises from Cunningham three to four times a week, and you'll be on your way to a toned tummy. But keep in mind that "consistency is the key to getting…