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Do Sit Ups Every Day And See What Happens To Your Body

Feb 15th, 2020
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  1. https://journals.lww.com/nsca-jscr/Abstract/1999/11000/Muscle_Activity_During_Sit_Ups_Using_Abdominal.7.aspx
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  3. https://www.ncbi.nlm.nih.gov/pubmed/19812508
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  5. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4488239/
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  7. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5283773/
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  9. https://www.ncbi.nlm.nih.gov/books/NBK241323/
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