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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.
The deltoids are a group of muscles located on the top of the shoulder and control the movement of the arm backward, out to the side and forward. Strengthening these muscles is important for strong pulling strength to achieve a full draw on the bow. Shoulder lifts help strengthen these muscles.