Breakthrough Belly Flattening Plan.1)Diamond Crunch.

Lie faceup on floor, knees open to sides, soles of feet together. Clasp hands and extend arms over chest. "Hollow" stomach by pulling navel toward spine. Then lift head and shoulders off floor, reaching as far forward as comfortably possible (shown). Hold for a moment, slowly lower to start position, and repeat. Perform 15 to 25 reps.