BIG ARMS AND STABLE SHOULDERS.
Shoulder external rotations are good for training the one of the actions of the rotator cuff, but we also need to consider the function of the rotator cuff.
Using arm training exercises in different degrees of shoulder extension (elbow behind the body), shoulder flexion (elbow above the shoulder) and shoulder external rotation (elbow rotated up), allow us to train the function of the rotator cuff muscles as they work to stabilize the shoulder.
Strengthen your rotator cuff muscles and end up with big arms? Sign me up.
https://blossom.primal.net/8c1d963181274a0cc26b8bc0c0d27c9383b59606e34960614f78e9147ec9f83e.mp4