"This exercise is for the scapula, the muscle between your shoulders. Its purpose is to basically learn how to push on the barbell correctly and to keep your arms straight. You basically want to bring your arms down and back up and then down again in as controlled a motion as possible. It's so when you're on the bench and push the bar up by your shoulders one arm is not pressing more than the other. It's to learn your balance. A lot of my exercises are centered on technique and learning how to not hurt yourself. This is one of them."