Speed endurance the key to *all* 11/12second sprinters?

[pierrejean]

@fogelson

In 2008, that seems definitely true, but what about 2009? Arguably, before WCs, his 200m performance was by far the best. Not even considering that it was his worst conditions weather wise, the time was the fastest relative to the 100s he ran.

How much the fact that he resumed training as late as Christmas and that he had a car accident in April affected the periodisation for 2009?