Unless your name is Jessica Alba, you probably weren't born with a pack of abs that resembles a cheese grater. But whether you're skinny as a rail or have recently let yourself go (to McDonald's a few too many times) and are concealing a nice pair of man boobs, you can perfect your midsection.
Watch this video to see how to use a stability ball to strengthen and tone your core.
Coach Nick Tumminello shows you how to get a killer Abs workout with 1 Arm Stability Ball Abs Plank. This Abs plank exercise will get you core strength quickly!