Proper shoulder biomechanics requires retracted shoulders. Allowing the shoulders to roll forward is a recipe for injury. Pull those shoulders back when doing any upper body exercise:

Wrong! Protracted, or rolled-forward, shoulders are poor form which can lead to a number of injuries. Note how the head moves forward (B) increasing risk for neck pain

Right! Pull those shoulders back (retraction), and not only will you look powerful you’ll decrease the risk of injury too.
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