Usain Bolt

Usain Bolt of Jamaica celebrates after winning gold in the Men's 200m Final on Day 13 of the London 2012 Olympic Games at Olympic Stadium on August 9, 2012 in London, England.

Usain Bolt of Jamaica races to the finish line to win gold ahead of Warren Weir of Jamaica in the Men's 200m Final on Day 13 of the London 2012 Olympic Games at Olympic Stadium on August 9, 2012 in London, England.

Left to right: Silver medalist Yohan Blake of Jamaica, gold medalist Usain Bolt of Jamaica and bronze medalist Warren Weir of Jamaica pose on the podium during the medal ceremony for the Men's 200m on Day 13 of the London 2012 Olympic Games at Olympic Stadium on August 9, 2012 in London, England.

Usain Bolt of Jamaica celebrates after winning gold in the Men's 200m Final on Day 13 of the London 2012 Olympic Games at Olympic Stadium on August 9, 2012 in London, England.

Usain Bolt of Jamaica celebrates winning gold in the Men's 100m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England.

Special section: The 2012 London Games

Usain Bolt of Jamaica wins gold in the Men's 100m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England.

Special section: The 2012 London Games

Left to right: Churandy Martina of Netherlands, Ryan Bailey of the United States, Usain Bolt of Jamaica, Justin Gatlin of the United States, Yohan Blake of Jamaica, Tyson Gay of the United States, Asafa Powell of Jamaica and Richard Thompson of Trinidad and Tobago compete in the Men's 100m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England.

Special section: The 2012 London Games

Usain Bolt of Jamaica races ahead of Ryan Bailey and Justin Gatlin of the United States to win the Men's 100m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England.

Special section: The 2012 London Games

Usain Bolt of Jamaica looks on before the start the Men's 100m Final on Day 9 of the London 2012 Olympic Games at the Olympic Stadium on August 5, 2012 in London, England.

Special section: The 2012 London Games

Jamaican gold medalist Usain Bolt gestures during the awards ceremony for the men's 200-meter at the International Association of Athletics Federations (IAAF) World Championships in Daegu, South Korea, on Sept. 4, 2011.

Special section: The 2012 London Games

Jamaican sprinters Yohan Blake, right, and Usain Bolt, left, run during the men 200-meter dash final of the Jamaican Olympic Athletic Trials at the National Stadium in Kingston, Jamaica, on July 1, 2012.

Special section: The 2012 London Games

Jamaican sprinter Usain Bolt reacts while finishing second in the men's 200-meter dash final of the Jamaican Olympic Athletic Trials at the National Stadium in Kingston, Jamaica, on July 1, 2012. Yohan Blake won the race with a time of 19.80 seconds.

Special section: The 2012 London Games

Jamaican sprinter Usain Bolt congratulates Yohan Blake on his victory in the men's 200-meter dash final of the Jamaican Olympic Athletic Trials at the National Stadium in Kingston, Jamaica, on July 1, 2012.

Special section: The 2012 London Games

Britain's Prince Harry races Usain Bolt at the Usain Bolt Track at the University of the West Indies on March 6, 2012, in Kingston, Jamaica.

Special section: The 2012 London Games

Jamaica's Usain Bolt, center, performs to win the men's 100-meter event during the Diamond League athletics meeting in Rome, Italy, on May 31, 2012.

Special section: The 2012 London Games

Usain Bolt of Jamaica wins the 100-meter men's race at the IAAF Compeed Golden Gala at Stadio Olimpico on May 31, 2012, in Rome, Italy.

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Jamaican sprinter Usain Bolt, left, and compatriot Asafa Powell celebrate after finishing first and second on the men's 100-meter at the Diamond League athletics meet at Bislett Stadium in Oslo, Norway, on June 7, 2012.

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Jamaica sprinter Usain Bolt salutes supporters after winning the men's 100-meter race of the Zlata Tretra (Golden Spike) athletics meeting in the eastern Czech city of Ostrava on May 25, 2012.

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Jamaican sprinter Usain Bolt, center, Jamican Clarke Larone, left, and Canada's Warner Justyn, right, compete in the men's 100-meter race at the IAAF Diamond League athletics meet at Bislett Stadium in Oslo, Norway, on June 7, 2012.

Special section: The 2012 London Games

Jamaican sprinter Usain Bolt poses after winning the men's 100-meter race at the IAAF Diamond League athletics meet at Bislett Stadium in Oslo, Norway, on June 7, 2012.

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Usain Bolt, left, of Jamaica collides with a flower girl after crossing the finish line to win the men's 100-meter at the IAAF Diamond League athletics meeting at the Bislett Stadium in Oslo, Norway, on June 7, 2012.

Special section: The 2012 London Games

Jamaican sprinter Usain Bolt reacts as he crashes into a flower girl after winning the men's 100-meter race at the IAAF Diamond League athletics meet at Bislett Stadium in Oslo, Norway, on June 7, 2012.

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Jamaican athletes Usain Bolt, left, and Marvin Anderson run in the men 200-meter dash semis of the Jamaican Olympic Athletic Trials at the National Stadium in Kingston, Jamaica, on June 30, 2012.

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Jamaica's Usain Bolt, bottom right, wins the men's 4x100-merter relay final at the International Association of Athletics Federations (IAAF) World Championships in Daegu, South Korea, on Sept. 4, 2011.

Special section: The 2012 London Games

Jamaica's Usain Bolt wins the men's 4x100-meters relay final at the International Association of Athletics Federations (IAAF) World Championships in Daegu, South Korea, on Sept. 4, 2011.

Special section: The 2012 London Games

Jamaica's Usain Bolt celebrates winning the men's 200-meter final at the 2008 Beijing Olympic Games on Aug. 20, 2008. Bolt broke the men's 200-meter world record, timing 19.30 seconds as he clinched the Olympic Games gold to add to his 100-meter crown.

Special section: The 2012 London Games

Jamaica's Usain Bolt runs to win the men's 100-meter final ahead of Trinidad and Tobago's Richard Thompson and Walter Dix of the U.S. in the 2008 Beijing Olympic Games on Aug. 16, 2008.

Special section: The 2012 London Games