I see more and more people preaching not to go to failure on more and more sets and am wondering why? I really don't see how one can gain if the INTENSITY isn't at a very high level. Don't get me wrong, I'm not saying going to failure in every set on every exercise is the way to go. I'm currently doing a 5x5 routine and obviously I don't work to failure on all my 5x5 sets, but my other exercises you bet your ass I am. I would like to hear pro's and con's from those who know why working(or not working) to failure is a good or bad thing.