Editing Push-up (section)

=== Deltoid ===
The anterior portion of the [[deltoid muscle]] is one of the major shoulder-joint horizontal adductors, moving the upper arms toward the chest during the upward phase of a push-up. It also helps control the speed of movement during the downward phase. The deltoid attaches to parts of the [[clavicle]] and [[scapula]], just above the [[Glenohumeral joint|shoulder joint]] on one end, and to the outside of the [[humerus bone]] on the other. Along with horizontal adduction, the anterior deltoid assists with flexion and internal rotation of the humerus within the shoulder socket.