SkySportsUsain Bolt puts 400m mission on hold until after 2012BBC SportJamaican sprinter Usain Bolt says he is unlikely to target the 400m record until after London 2012. Michael Johnson, world record holder at 43.18 seconds .

(News Sport Terupdate) – Jamaican sprinter Usain Bolt says he is unlikely to target the 400m 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 …