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How to Do Crunches: Proper Exercise Form & Variations

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Crunches are an extremely effective compound-muscle ab exercise. When done correctly, they target your upper abdominal, lower abdominal, oblique, and lower back muscles, and have less risk of injury than traditional sit ups. This article

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How to Do Crunches: Proper Exercise Form & Variations

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How To Do Crunches, Abdominal Crunch