They've seen every gym mistake in the book. Here's what personal trainers say you should stop doing immediately.

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. I used to feel awkward ...

Whenever you walk into a new gym, one space inevitably catches the eye: the main floor, filled with cardio machines of all kinds, rows and rows of ’em. And whether you’re there for a chill yoga class ...

I'm a Fitness & Nutrition writer for CNET who enjoys reviewing the latest fitness gadgets, testing out activewear and sneakers, as well as debunking wellness/fitness myths. In my free time I enjoy ...