I noticed the same thing and suspect that when going slower, the runner was able to give us an example of how to run by the books but then when going faster his natural technique came out.richardsimkiss said:Yet a few minutes into the video where he starts to pick up the pace a little you can see him heelstriking? not HEAVILY heelstriking, but certainly not forefoot striking as before? and exactly the same happens later on when they show a guy running across grass "notice how his foot strikes the ground...." then soon after you can see him heelstriking?
I wonder if a coach has ever tried to correct that in her...
I know that Peter Coe used to work on every detail of Seb's technique - with great results.