Usain Bolt push Bolt to do longer sprinting distances with the aim of making the 400 m event his primary event by 2007 or 2008. Bolt was less enthusiastic, and demanded that he feel comfortable in his sprinting. He suffered another hamstring injury in March 2006, forcing him to withdraw from the 2006 Commonwealth Games in Melbourne, and he did not return to track events until May. After his recovery, Bolt was given new training exercises to improve flexibility, and the plans to move him up to the 400 m event were put on hold. The 200 m remained Bolt's primary event
Usain Bolt in the sport. From his record time of 9.58 s for the 100 m sprint, Usain Bolt's average ground speed equates to . However, once his reaction time of 0.148 s is subtracted, his time is 9.44 s, making his average speed . Bolt's top speed, based on his split time of 1.61 s for the 20 metres from the 60- to 80-metre marks (made during the 9.58 WR at 100m), is 12.42 m/s (). "World rank in parentheses" Usain Bolt Usain St Leo Bolt (; born 21 August 1986) is a Jamaican retired sprinter and world record holder in