Yea it is some what new. Everything I ever read and learned from other people always said failure was key and it is good for some HIT and go past failure every once and a while. But I research CNS overtraining and it implies that training till failure is good but to do it every w/o is bad. There are a ton of articles on the web on the subject. I am not 100% “sold” but there studies behind it. Training till failure and espically past failure has yielded decent results for me. So from time to time I stop 2 reps b4 failure.