Building muscle depends on several factors and isn't something that'll happen overnight after just one workout.

Women's Health may earn commission from the links on this page, but we only feature products we believe in. Why Trust Us? I have been working out my entire life—I ran multiple marathons, regularly ...

I have been working out my entire life—I ran multiple marathons, regularly took bootcamp-style fitness classes and Pilates, but I never committed to building muscle. When I did lift weights (mostly in ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." I have been working out my entire life—I ran multiple marathons, regularly took bootcamp-style fitness ...