That the negative portion of a rep is much more (about 3X) damaging to the muscle fiber than the positive portion? That's why strict slow form is so crucial! So when you're working out next time keep this in mind!
every set every time. incorporate negatives and forced reps once or twice a month. we can and do disagree on all most everything but success in training is 100% dependent on INTENSITY.
to burn out your CNS you need to not just go to failure but go to the extreme. thats not what I am talking about when i say failure. I am saying when you do a set you go until you cant do anymore then rest.