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 saying that the prospect of having to return the gold was "heartbreaking". The banned substance in Carter's test was identified as methylhexanamine, a nasal decongestant sometimes used in dietary supplements. At the 2017 World Athletics Championships, Bolt won his heat uncomfortably after a slow start in 10.07, in his semi-final he improved to 9.98 but was beaten by Christian Coleman by 0.01. That race broke Bolt's 4 year winning streak in the 100m. In his final individual race, in the final, Bolt won the Bronze medal in 9.95, 0.01 behind Silver medalist Coleman and 0.03 behind World Champion Justin Gatlin.