Usain Bolt - the world's fastest man

Updated 1536 GMT (2336 HKT) August 29, 2015
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Usain Bolt of Jamaica crosses the finish line to win gold in the men's 4x100 metres relay final ahead of Mike Rodgers of the United States at the 2015 World Athletics Championships in Beijing. Christian Petersen/Getty Images AsiaPac
The Jamaican relay team (L-R) Nickel Ashmeade, Asafa Powell,Usain Bolt and Nesta Carter pose for photographers after winning the final of the men's 4x100 metres relay event. OLIVIER MORIN/AFP/AFP/Getty Images
Bolt has now won 11 gold medals at World Athletics Championships, including three in Beijing this week. Andy Lyons/Getty Images AsiaPac/Getty Images
The Jamaican relay team celebrate by taking selfies with fans. JOHANNES EISELE/AFP/AFP/Getty Images
Bolt had already seen off Justin Gatlin to land the 200m title in Beijing Thursday. Ian Walton/Getty Images AsiaPac/Getty Images
Bolt recorded a time of 19.55 seconds to beat Gatlin, who finished second in 19.74s. Michael Steele/Getty Images AsiaPac/Getty Images
"There was never a doubt that I would win this one," Bolt, who won the 100m title Sunday, said after the race. "I'm number one." Alexander Hassenstein/Getty Images AsiaPac
Gatlin had to settle for his second silver medal of the 2015 World Athletics Championships after missing out to Bolt in the 100m final as well. Michael Steele/Getty Images AsiaPac/Getty Images
The best home video ever? Bolt records the medal ceremony during which he's given the gold he won in the men's 100 meter at the 2015 World Championships in Beijing. Michael Steele/Getty Images AsiaPac/Getty Images
Bolt beat his rival Gatlin by one 100th of a second Sunday. Gatlin was the pre-race favorite and has ran the fastest time this year, but he is a divisive figure due to his previous bans for doping offenses. Ian Walton/Getty Images AsiaPac/Getty Images
The taste of success is nothing new to Bolt, who made it nine World Championship gold medals with his triumph on Sunday. Ian Walton/Getty Images AsiaPac/Getty Images
Bolt of Jamaica won in the Men's 100m final at the World Athletics Championships Beijing 2015 Sunday with a time of 9.79 seconds. Cameron Spencer/Getty Images AsiaPac/Getty Images
Victory in Beijing means Bolt holds on to his tag as the world's fastest man. Streeter Lecka/Getty Images North America
Bolt may be the fastest but he is just one sprinter off a conveyor belt of talents to come from Jamaica. ALEXANDER NEMENOV/AFP/AFP/Getty Images
The secret to his speed and that of his countrymen and women, says Bolt, is the level of internal competition. YURI KADOBNOV/AFP/AFP/Getty Images
The reason behind the Caribbean island's success appears to be down to the sprint system for budding athletes from day one. AFP/AFP/AFP/Getty Images
Bolt arrived in Beijing as defending triple world champion having won his 100 meter gold in Moscow two years ago under the backdrop of lightning. OLIVIER MORIN/AFP/AFP/Getty Images
But his career high - at least in speed terms - was at the Worlds in 2009 where he set a 100m world record of 9.58 seconds. Andy Lyons/Getty Images Europe/Getty Images
He subsequently shattered Michael Johnson's 200m record at the same championships with a time of 19.19 seconds. MICHAEL KAPPELER/DDP/AFP/Getty Images
Bolt has been coached to the top by Glen Mills, a key figure in shaping the sprint talent that Jamaica has to offer. Ian Walton/Getty Images Europe/Getty Images
Bolt appeared to be struggling this season with form and fitness but won the Anniversary Games 100m in a time of 9.87 seconds. Ian Walton/Getty Images Europe/Getty Images
It brought with it the trademark "Lightning Bolt" celebration. Jamie McDonald/Getty Images