The PowerBlock shoulder external rotation strength training exercise - side lying targets the external rotators of the shoulders. The external rotators are susceptible to injuries and should be strengthened before increasing loads on bench presses, cleans, and snatches. Throwing and swinging motions also put weak external rotators at risk in this workout plan. You may place a rolled up towel under the elbow for better muscle isolation of the infraspinatus and teres minor.
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