I would like to add just a little challenge to my class. We are doing squats with a bar on our shoulders and I want to know if it is safe to jump with the weight on your shoulders? If so, is there a limit to the weight? A limit to height and depth of the jump? Should we make sure the bar stays on our shoulders and does not rise off, even an inch?
I will never suggest that to anybody. Even if you try to control your body in a very stable position, you take a big risk. Something which is making you taking an extra care of your movements and body, is not good. That can take you to a big physical instability while you are executing that type of exercises.