Dempsey doin the Dempsey Roll

old film of Jack during a training session working on power endurance. Beside the obvious fact that he is not punching at the bag but through it, the great by-product of this clip is the demonstration of his shoulder roll. Unique to Jack his shoulder performed a figure eight while his torso had a slight rotation to it. Also we see him making sure the powerline is entact by punching horizontally below shoulder level. You might take note of how he is dragging his back foot forward, almost to a horizontal pos