Is there some benefit I don't know about by using the entire bodies' momentum to lift the stack up? You ARE supposed to do this lift in a slow and controlled manner, right? It seems like everyone at the gym I go to goes through it so fast that their ass almost gets lifted off the seat with the weight of the stack on its way back down. Also, I bring the bar down past my chin to the lower portion of my neck, that's about right, right?