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 third world record. In January 2017 the Jamaican relay team were stripped of their gold medals after a blood sample taken from Nesta Carter – one of Bolt's teammates in the relay – after the race, was tested again nine years later and tested positive for a banned substance. Following his victories, Bolt donated US$50,000 to the children of Sichuan province in China to help those harmed by the 2008 Sichuan earthquake. Bolt's record-setting runs caused commentators not only to praise his achievements but also to speculate about his potential to become one of the most successful sprinters ever. Critics