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Machine Lateral Raises.

If you are suffering from a past should injury, this is a good rehab exercise. Consult with your physician first. This is called the Machine Lateral Raises.  You want to have your arms and your elbows at a 90-degree angle.

Raise your arms to your side so your elbows are aligned with your shoulders. Smoothly return to starting position.

Contract your deltoids at the top of the rep and get a good contraction.