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The shoulder is composed of several muscles that attach to the clavicle, humerus and scapula. These muscles, which include the trapezius, deltoid, supraspinatus and infraspinatus, are responsible for movement of the shoulder and can be targeted for strengthening in several different ways. <br><br>Free weights work the muscles through a greater range of motion than barbells or machines, and also utilize more stabilizing muscles during a lift. This will improve your flexibility and help in developing a more balanced physique. Here is how to strengthen your shoulders with dumbbell exercises.