Barbell training is comprised entirely of natural human movement. This means that the exercises used are how human physiology and anatomy are supposed to be used. The rotator cuff is a good example. The rotator cuff can produce external and internal rotation of the shoulder, but what it actually does is pull the arm into the shoulder joint. Essentially, it protects the arm from ripping out of its socket. This is apparent while analyzing the anatomy – the muscles attach close to the shoulder joint.
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