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. Calluses, those areas ...

As a New Yorker who considers a few miles of daily walking no big deal (thanks for tracking, Apple Watch), a barre-class addict and genetic haver-of-unfortunate-feet, I’ve had calluses that shock even ...

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