Well, I think that what you will find is that it needs less "large muscle group" stuff. Depending on what you do, things like calves, abs, etc (small muscle groups that you isolate) will be tolerable on leg day. I think that I do legs, then some PC or back work, but I agree that it can be a bit much. I counter that by using higher rep sets on my support work and lower reps on my leg work. I have a hard time doing anything after 20 rep squats.