The 5-Minute Ultimate Core Workout

Who can resist a toning two-for-one deal? That's why we love this strengthening and shaping workout from instructor Maryanne Blake at the Sports Club/LA—Boston, based on her hot ZenCore class. Each move 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.

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