Rock 360, $14.95 This newish product reminds me of the old-school ab wheel that you rolled forward and backward. Only here, you can roll it in any direction to work every inch of your midsection. Now, the pros about this thing: first, I like that its founder, Tommy Saunders, actually played football at a high level—for the University of Missouri—so he understands what an athlete goes through. Two, it will definitely work. It’ll create elongation in your ab muscles and challenge you. The cons: it’s probably not suited for someone who’s really out of shape. And if you don’t have much lumbar strength, it could put a great deal of stress on your lower back.