Lydiard or Speed Endurance?

[Mike T]

" There is clearly something going on in terms of a predisposition to be exceptional at something, but far more important is the 10,000 hours or whatever...of dedicated, delberate, intentional practice that creates absolute mastery of a very domain specific thing.. whather it's Sara Baras dancing or Chris Hoy sprinting."

Peter Keen. Performance Director UK Sport until recently.

!0,000 hours of practice may well be necessary for success, but by itself it is not sufficient.