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Backward movement toward the midline of the body; moving the scapula back toward the spine during retraction of the shoulder girdle. Typically accompanies Shoulder External Rotation, Transverse Abduction, and Tranverse Extension. 1  Trapezius (middle fibers). 2  Trapezius (lower fibers).
During the exercise, the serratus anterior, rhomboids and pectoralis minor stabilze the scapula so that the humerus can move from a stable base. Lie on a horizontal exercise bench with your knees bent and feet flat on the floor. Hold a dumbbell in the palms of both hands with your thumbs surrounding the handle.