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Some lifters will retract the scapulae and hold them there, as opposed to letting them protract, to get a better stretch in the posterior deltoid. Muscles that retract the scapulae include the rhomboid muscle and the trapezius muscle. The forearm should have a neutral grip, the back of the hand should be facing outward (laterally), turning to face away from the ground as the arm raises. The palms should be facing inward, moving to face towards the ground as the arms raise. Due to the external (lateral) rotation, the work is shifted forward and the lateral head of the deltoid assist the lateral rotators in transverse abduction. [2] The arms have the same orientation relative to the ground as in the ”shoulder fly” which is done to target the lateral deltoid. The difference is that the angle of the torso changes, and the change in the shoulder's rotation and angle of movement relative to the body means the lateral head is a synergist rather than the prime mover. If the lifter does not lock the elbow, the lateral rotators (posterior deltoid, infraspinatus, teres minor) are also involved in preventing internal (medial) rotation. The more the elbow is bent, the more leverage gravity has pull the hand down and turn into a transverse extension angle. A bent elbow can allow greater weight to be lifted, and may shift the work of transverse abduction more heavily onto the lateral head of the deltoid as the prime movers work to prevent internal rotation. Supine rear delt row end. ^ Jim Stoppani (2014). boombet.