The point has already been made.
Sorry about that...knees are kind of an issue for me. Despite being 22, a few years of Muay Thai has already ruined my legs to the point where it's hard to walk on rainy days. I've been chewed out at a number of dojos (only in america, ironically) by a lot of people who feel that they must do everything "like they do in Japan". (sadly, before my knees gave out, I was one of that type too)