Also take a look at the post by pavel that shows Asapha run the 300m.
http://www.youtube.com/watch?v=bACUl96_zcQ
The Brigitte race:-- the male second from the outside, his head is a bit proud at the take off but comes in line pretty quick, then the Asapha run. Both look pretty damn good. I am focussing on the imaginary line drawn along the back from the centre of hips to the top of head. My grandmother used to chat me when I was a kid, she called it posture.