Understanding progressive overload is a must to up your muscle mass, trainers agree.

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 ...

Eighty-one? I shook my head and surreptitiously leaned over to get a better look at the number Sharpie’d on the calf of the tall, lean, and considerably older woman setting down her running shoes in ...