Until a few years ago, I was thin but unfit. Literally clueless about what to do in a gym. Then metabolism hit me in the face (actually, my waistline), and I had to learn the ins and outs of fitness ...
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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. While plenty of ...