Over the years you've perfected your gym routine. You hit your pecs, lats, bi's, and tri's on a consistent basis. But is this to your downfall?

Sure, these mirror muscles garner attention on the beach in the summer and fill out a sweater in the winter. However, you're probably neglecting some lesser-known groups that play an important role in injury prevention. We've highlighted what they are, what they do, and how to train them.

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