Did you know ballet is the most physically demanding sport on earth?!?

I definitely did not, but I was watching a Discovery Channel presentation on the limits of the human body and they said ballet is the most physically demanding sport on earth. Why? Because the pressure applied on the foot bones when they dance point (on their toes) is equivalent to THREE elephants stacked on top of each other focused in that one area.....WOW! And they also feel the pain that comes with it but have to continue leaping and smiling....geez....