Yes, I went out to the supermarket after my graduation run (Ooh, I love that lol) and the check out lady commented on my atire and then went on to say that she hated exercise and couldn't run and anyway, she had bad knees. I smiled and said, do you know, I also HAD bad knees. my knees used to grind and grate and ache going upstairs and especially down stairs and yes, the first two or three weeks they ached from running but now they don't!
I had actually said this to Peter the day before in leeds (when I had to walk up stairs (twice) to find a toilet) normally, they would have been hurting, and now they don't.
Aside from being able to run, my knees are obviously stronger and less painful---I am reluctant to say pain free just in case.
It seems I am becoming a fanatic and feel like singing from the rooftops about the benefits of running lol