Think of this as a 3 part movement. It will stress the entire shoulder, and is a great way to bring the external rotation of your rotator cuffs up to speed.
Part 1 - the upright row
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Begin holding a pair of light dumbells at your side, your shoulders rotated forwarders and palms facing towards your body.
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Raise the dumbells with your shoulders, to the point where your upper arms are parallel to the ground at shoulder height, and your forearms are at a 90 degree angle to your upper arms.
Part 2 - the rotation
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Keeping the 90 degree bend in your arms, use your shoulders to rotate your arms 180 degrees, such that you are in the lower position of an overhead press.
Part 3 - the overhead press
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Press the dumbells overhead for the remainder of the movement.