"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Achieving strong, defined arms or legs is about more than just lifting weights. A ton goes into growing ...

Everyone is familiar, at least hand-wavingly, with the distinction between slow-twitch and fast-twitch muscle-fiber types. The former are great for running marathons; the latter are ideal for ...

WASHINGTON - Most people who work out have a pulling exercise somewhere in their routine - a row, a pulldown, maybe a pull-up. But far fewer could tell you which muscles they’re actually training, or ...

Plus, how to get the most of your walking workout.

Achieving strong, defined arms or legs is about more than just lifting weights. A ton goes into growing your muscles—and that includes proper nutrition, recovery, and working out in a specific way.