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The 5-Minute Ultimate Core Workout: You rely on your back muscles and abs for virtually every move you make. Here's how to show it some love. Each move in this workout challenges your core—those crucial ab and back muscles you call on every time you turn, bend, lift, you name it—while sculpting other muscle groups, too. | Health.com

The 5-Minute Ultimate Core Workout: You rely on your back muscles and abs for virtually every move you make. Here's how to show it some love. Each move in this workout challenges your core—those crucial ab and back muscles you call on every time you turn, bend, lift, you name it—while sculpting other muscle groups, too. | Health.com