belly buster: Sit on ball and lean back with hands on floor behind you, palms down and turned out, legs extended. Bring right knee toward chest (as shown); return to start. Repeat with left knee for 1 rep. Do 12 reps
If you want pancake-flat, carved-up lower abs and a razor-sharp V-cut, consider The Lower Abs Trifecta your little secret weapon. Comprised of 3 different ab exercises back-to-back, it'll absolutely demolish your lower abs and leave you sore for days. That's exactly what we want -- hyperaccelerated growth.