It could be a while before Bolt is celebrating a gold in the 400m
Jamaican sprinter Usain Bolt says he is unlikely to target the 400m world record until after London 2012.
Michael Johnson, world record holder at 43.18 seconds for the one lap, has suggested the Olympic and world 100m and 200m champion should change events.
But 23-year-old Bolt said: "The 400m is painful! I think it is somewhere in the future but hopefully after 2012."
He clocked an impressive 43.58s split at a recent 4x400 relay and will run over 300m in the Czech Republic in May.
The world's fastest man often uses the 400m to fine-tune his fitness before the start of the season and opened his campaign in February by running the one lap in 45.86 in the Campertown Classic in Jamaica.
Next on the calendar for Bolt will be the 300m at the Golden Spike event in the eastern Czech city of Ostrava on 27 May.
Regarding his attempt to break the 300m world mark of 30.85s set by the American Johnson in Pretoria 10 years ago, Bolt said: "I have done some 300s in training so I am used to the distance but this will be my first time to race it.
"If the weather is good I hope to run a fast time."
It will be his only appearance outside of the new 14-event Diamond League [the replacement for the Golden League] where he will kick off his campaign in New York on 12 June.
Bolt is unlikely to compete in the Commonwealth Games and despite this summer's European Championships in Barcelona being the only other major athletics event this year, the Jamaican remains focused on producing the goods.
"Training is going well," Bolt added. "I am getting ready for the summer season. My early races in Jamaica have been good so I think I am where I need to be at this time of year.
"There is still a lot of work to be done in the next two months but I am getting there. I just want to keep winning and stay injury free."
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