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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 ...