ive read 2 different theories on this, 1st being for these exercises you should use a higher rep range like 15-20, because of the amount of weight and also the type of movement(basically full body) on these exercises taken to that many reps will cause a huge increase of hormones and HGH and also of course growth in that area. I've also read that you should use the tride and true heavy low reps like anywhere from 4-10... can someone who knows the optimum rep range for these exercises help clear this up...