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The pectorals or pecs are the large chest muscles. They are full of thick muscle fibers and add size to the upper body. The chest is divided into two parts, pectoralis major, and pectoralis minor.
A large, flat muscle on the back that stretches to the sides, behind the arm, and is partly covered by the trapezius on the back near the midline. It is sometimes called ‘lats’ or the ‘wings’.
This muscle is found in the front of the upper arm. The biceps help control the motion of both the shoulder and elbow joints. At the elbow, the biceps are essential in lifting, and at the shoulder, they help with moving the arms sideways, forward and upwards. Basically, this muscle helps bend or curl the arm toward your body.