 In June 2008 , Bolt responded to claims that he was a lazy athlete , saying that the comments were unjustified , and he trained hard to achieve his potential . However , he surmised that such comments stemmed from his lack of enthusiasm for the 400 metres event , and chose to not make the effort to train for distance running . Turning his efforts to the 200 m , Bolt proved that he could excel in multiple events — first setting the world @-@ leading time in Ostrava , then breaking the national record for the second time with a 19 @.@ 67 s finish in Athens , Greece . Although Mills still preferred that Bolt focus on the longer distances , the acceptance of Bolt 's demand to run in the 100 m worked for both sprinter and trainer . Bolt was more focused in practice , and a training schedule to boost his top speed and his stamina , in preparation for the Olympics , had improved both his 100 m and 200 m times . 
