As I was working out yesterday, I made a change to the way I performed shrugs. I am not particularly pleased with my trap development, so I thought I might have been performing the movement wrong. Previously, I would merely hold the bar and draw my shoulders up as far as they would go. This last time, I drew my shoulders back, sticking out my chest. I maintained this position and peformed the shrug this way. When looking in a mirror while doing the two movements, I saw that the first method resulted in my shoulders moving up and forward, as if they were rolling. With the second, they went straight-up and down and the lift looked to be proper. Just to clarify, is the first or second the correct form? Thanks.