Line dance

I took the risk to attend line dance class this morning. I thought line dance was easy enough without any big movement, and the teacher also kept reminding me not to do those movements that needed to bend the knees. But gee...it hurted after the first half hour. It actually required more knee movement than I thought. I finished the whole one-and-a-half-hour though, but I also plan to have some good rest this weekend (the dancing teacher also said there's nothing I could do except DON'T MOVE AND REST)...after Sandy Lam in concert tonight :)