07/01/2014 10:05 am ET Updated Jul 01, 2014

6 Workout Moves You're Not Doing -- But Should Be

Cultura RM/Peter Muller via Getty Images

One of the biggest gym mistakes is only training your "mirror muscles" -- you know, the ones you can stare in the mirror (abs, anyone?). But, there are plenty of muscles that are essential to your overall health as well as your physique. Just because you can't see it, that doesn't mean you shouldn't train it.

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