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The deltoid muscle is located on the outer aspect of the shoulder and is recognized by its triangular shape. The deltoid muscle was named after the Greek letter Delta due to the similar shape they both share. The deltoid muscle is constructed with three main sets of fibers: anterior, middle, and posterior.
Shoulder Muscles. The deltoids are the muscles of your shoulder, which play a crucial role in rotating your arm. Strengthening these muscles will help you put more force in your wind-up, allowing you to throw the ball harder. Among the most effective shoulder-strengthening exercises are the standing military press, seated dumbbell press and upright rows.