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Behind the Neck Shoulder Press Machine (Works Your Shoulders)

To use this machine, you sit with a straight bar behind your neck with your arms bent in "goal post" formation, as you push the bar up and overhead. "Problem is, when you place your shoulders into this extreme external rotation it stresses the shoulder joint and increases the risk of impingement," says Brad Schoenfeld, author of "Sculpting Her Body Perfect." Impingement occurs when the space between the rotator cuff muscles and a bone on top of the shoulder narrows, pinching the tendons.

Safer Pick: Front Dumbbell or barbell shoulder presses Hold dumbbells out to the sides with your wrists stacked above your elbows at a right angle. Push them overhead and together and then back to the starting position. Repeat 12 to 15 times for two to three sets.

(CREDIT: Thinkstock/Comstock Images/Getty Images)
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