I put a great deal of effort and attention into my training, and have long been interested in physiology and movement. I do great warm ups!
I have come to realize that group warm ups suck! They are often necessary for beginners and those who are out of touch with their bodies, but in truth, a warm up is and should be highly personal.
Funny you say that...after the brief group range of motion warmups I lead my little class through, I always say, "we are all different, so now everybody take 2 or 3 minutes to move around the mat however you need or want to, working on whatever your body needs." No two of us ever do the same things...