Let's talk chalk. Resin, also known as rosin, colophony, and colophonia, amongst other names, is present in many liquid chalks commonly used for climbing, gymnastics and weight training. It's usually ...

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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. If you’ve ever seen ...