The back consists of large, complex muscles that support your trunk and spine. There are many types of back muscles, and they are all essential, helping you walk, bend, twist, and hold your body ...

You're currently following this author! Want to unfollow? Unsubscribe via the link in your email. Follow Gabby Landsverk Every time Gabby publishes a story, you’ll get an alert straight to your inbox!

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 ...