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I swapped my usual ab routines for three new dumbbell exercises and tested them for one week; here's what happened to my core ...
Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. When you’re just ...
I swapped my usual ab routines for three new dumbbell exercises and tested them for one week; here's what happened to my core ...
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