Exercise Tweaks to Flatten Your Belly

5 New Ab Exercises

Upgrade your tired abs moves with these muscle-defining variations from Men's Health magazine
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5 New Ab Exercises // A man's abs c Thinkstock

Image: Thinkstock

These 5 new spins on old ab workouts work you harder, so you can build muscle faster, says Jim Smith, C.S.C.S., cofounder of Diesel Crew.

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