This afternoon I became acquainted with my ITBs. I had experienced some sharp pain on the outside of my left knee while running, on two occasions. I went to a sports physician because of that and pain under my knee caps -- prescribed some physical therapy. I saw a physical therapist this afternoon and, in no time, he found that my ITBs and quads are really tight.... fast forward to the roller stretches: they are extremely painful. I'm supposed to do 20-30 reps and I had to take a break after 10. Ouch.