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. Curls are the classic ...
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The muscle guide to biceps and triceps
WASHINGTON - Flex your arm. You already know which muscle you're showing off. The biceps are among the most recognizable muscles in the human body, but they share the upper arm with a less-celebrated ...
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