Usain Bolt is an athlete.
The 11th World Championships in Athletics , under the auspices of the International Association of Athletics Federations ( IAAF ) , were held at Nagai Stadium in Osaka , Japan from 24 August to 2 September 2007 . The men 's 100 metres at the 2015 World Championships in Athletics was held at the Beijing National Stadium on 22 and 23 August . Usain Bolt . The 2008 Olympics was his international debut over 100 m ; he had earlier won numerous 200 m medals ( including 2007 World Championship silver ) and holds the world under-20 and world under-18 records for the event .