Trainers Reveal: The Best Abs Exercises of All Time--- to make it even harder rotate the ball with feet going 3/6 to 6/12 o'clock... this is stupidly hard I died when my trainer made me do them.
We asked 20 top fitness experts for their all-time favorite exercise for a strong, flat stomach. Try some or all for the best abs workout ever!
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How to get a FLAT BELLY with a tennis ball (it's fun... try it) ABS!