I saw this picture on the NY Times Sports page this morning;
at the risk of being sued for copyright infringement I am using it here. For
those of you that advocate not letting the knee go beyond the toe, take a close
look. I will give you a small clue; the knee goes where it has to go. The key
is to train so that it goes go where it has to go with control. Creating artificial
training environment where the knee never goes past the toe does not prepare the
knee for the forces generated in this movement.