So my shoulders look as though they curve in a bit and although the front part of them is big and has nice definition they just slope of in the back, my traps are fine but it is the back half of my shoulders... it is like there is nothing there and all the muscle is in the front half which makes them almost curve inward?? anyone else have this problem, what exercises should I do to correct it? I was thinking behind the back shrugs with the smith but what else...