Bolt not sure of another Olympics

LONDON – With sprinters like Yohan Blake and Warren Weir nipping at his heels, Usain Bolt said there were no guarantees he would be around for a fourth Olympic Games in Rio 2016.
“I think it is going to be a hard mission,” the Jamaican told journalists after winning the 200 metres last night at the London 2012 Olympic Games.
Bolt had just created history by becoming the first sprinter to win back-to-back titles in both the 100 and 200 metres. It was also an unprecedented Jamaican sweep in the half-lap.
Bolt crossed the line first in 19.32 seconds, just off the Olympic record. Blake was second in a season’s best 19.44 and Weir did a personal best 19.84. All three are trained by coach Glen Mills.