who does it? what do you do to add it into your overall training etc.....

i know a lot of guys arent aware of this but glute imbalances and improper firing can cause a host of issues from knee and back pain to crappy squats. i had some pretty nasty issues with one of my knees a couple years back myself and actually had to go in for pt. turn out it was coming from my glutes not firing properly. since addressing the issue, my knees are much better and i squat much more comfortably.