What Muscles Do Sit-Ups and Crunches Work?. Nike.com
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Why can't I do a single sit up? I'm 15, 5'7, I workout pretty much everyday and have a somewhat strong core (I can do most core exercise). But, I still can't
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:max_bytes(150000):strip_icc()/GettyImages-523277402-cc780316bae6430585b13b5fcb8635a7.jpg "How to Do Sit-Ups: Techniques, Benefits, Variations")