How to Do Crunches: Proper Exercise Form & Variations

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

How to Do Crunches: Proper Exercise Form & Variations

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How to Do Crunches: Proper Exercise Form & Variations

Reverse Crunch