There are two things I know to be true. One, I love a challenge. (Perhaps you remember my daily plank practice?) And two, I hate failing. When the opportunity to partake in a flexibility challenge ...

I'm always working on a side quest, from getting certified in an obscure professional trade (airbrush tanning) to developing a new skill (just because I live in Manhattan doesn't mean I can't learn to ...

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 been ...