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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.
Three Methods:Deltoid ExtensionPush-upsPike PressCommunity Q&A. The deltoid muscles, or deltoideus muscles, are the rounded muscles over the top and sides of the shoulders. There are 3 different sets of muscle fibers that comprise the deltoids: the anterior, lateral and posterior. This muscle allows the shoulder to flex and helps support the rotator cuff. Many weight-lifters do exercises to strengthen and grow their deltoid muscles.