Interesting article…
http://projects.ict.usc.edu/itw/gel/EricssonDeliberatePracticePR93.pdf
Comments?
Not a brand new concept by any means and this type of research has been expanded upon vastly. Malcolm Gladwell’s work could be a good start if you’re interested.
As it relates to innate movements like sprinting, I’m going to take a wild guess and say it matters significantly less than small motor and cognitive skills, which is where most of the research is focused.