genetically, my shoulders just don´t have it. I can do shoulder work ´till the cows come home, my shoulders are just not going to get any bigger. I stopped wasting my time a while back and only do standing overhead presses. My legs got the genetics going on, however, and the majority of my leg mass comes from biking. I only do light, full squats anymore otherwise they explode. I wish my shoulders had 1/10 the growth potential of my legs, but I´m an endurance biker so I guess it is all okay.