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When doing an abs circuit, think about all three planes of motion, says celebrity trainer Gunnar Peterson, who works with Sofia Vergara, Kim Kardashian, and Vanessa Lachey: Try crunches and reverse crunches to hit your sagittal (front to back and up and down) plane, standing side bends for frontal (side-to-side) movement, and chops or twists for transverse (rotational) action. This will help challenge and therefore define your abs.
Everything you need to shrink your stomach, reduce bloat, and rock that bikini
Everything you need to shrink your stomach, reduce bloat, and rock that bikini.
Toned, athletic woman with great abs
The 30 Greatest Flat-Belly Tips of All Time