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 It was the first time Bolt had been beaten at a major championship since the 4×100 m relay of the 2007 World Athletics Championships. Also at the 2017 World Athletics Championships, Bolt participated as the anchor runner for Jamaica's 4×100-metre relay team in both the heats and the final. Jamaica won their heat comfortably in 37.95 seconds. In what was intended to be his final race, Bolt pulled up in agony with 50 metres to go and collapsed to the track after what was later confirmed to be another hamstring injury. He refused a wheelchair and crossed the finish line