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Your A-to-Z Guide to a Flat Belly

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Y-Yoga

Women who are the most stressed have the largest waistlines, a Yale University study says. A likely culprit: excess cortisol, a stress hormone. An hour of yoga can lower cortisol levels.

Z-Zip up midrise jeans

Wear low-rise denim and you risk a muffin top, Adams-Geller says. Choose a midrise with a wide waistband instead.