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 Bolt was a member of the silver medal relay team with Asafa Powell, Marvin Anderson, and Nesta Carter in the 4×100 metres relay. Jamaica set a national record of 37.89 s. Bolt did not win any gold medals at the major tournaments in 2007, but Mills felt that Bolt's technique was much improved, pinpointing improvements in Bolt's balance at the turns over 200 m and an increase in his stride frequency, giving him more driving power on the track. The silver medals from the 2007 Osaka World Championships boosted Bolt's desire to sprint, and he took a more serious, more