acole & LBSS i chose this specific video between the many existing, exactly because it shows it is NOT fast forward. The first takes are missing frames indeed that's obvious.
But go to 0:24 and re-watch/time it. Shit is real...
Ha, like LBSS I didn't really watch past the editing bit. He is pretty fast!
It makes me think of the differences in 'sprinting' across sports that aren't T&F. We had some football (soccer) players come and train in my sprint group and they consistently pop up very early out of the start - I guess because during a game, an accelerating player has to stay upright and ready to intercept or kick the ball, which changes the mechanics.