The lateral group, also commonly referred to as the side head of the shoulder muscle. Like the anterior, or front shoulder muscle, it originates from the collar bone and is attached to the humerus. This group is responsible for rowing movements and is effective in carrying heavy loads and lateral movements.
The side shoulder muscle if developed and toned, can lead to the impression of a smaller waist as wider shoulders will give this illusion. Performing most types of side lateral raise exercise directly targets this muscle group.