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Crunches get a bad rap, but they're a solid core exercise. Here's how to do crunches correctly, including 14 other types of crunches you can do.
Crunches get a bad rap, but they're a solid core exercise. Here's how to do crunches correctly, including 14 other types of crunches you can do.
How to Do Crunches Correctly — Plus 14 Variations
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How to Do Crunches Correctly — Plus 14 Variations
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