Jamaican sprinter Usain Bolt looks back at his Olympic competitors during a 100-meter semifinal in August 2016. Bolt won the final a short time later, becoming the first man in history to win the 100 meters at three straight Olympic Games. See more photos from Bolt's legendary career, which includes eight Olympic gold medals and world records in the 100 and 200 meters.
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Bolt wins the 200 meters at the 2003 World Youth Championships in Sherbrooke, Canada. He went pro a year later.
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Bolt, at age 19, runs the men's 200-meter during the 2004 Olympic Games in Athens, Greece. He didn't make it out of the first round of qualifying.
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Bolt listens to a question at a news conference before the 2005 World Championships.
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Bolt trains in Kingston, Jamaica, in 2006.
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Bolt broke the 100-meter world record in 2008, at the Reebok Grand Prix in New York. He finished the race in 9.72 seconds, topping the record that countryman Asafa Powell set a few months earlier.
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Bolt attends a promotional event ahead of the Beijing Olympics in 2008.
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Bolt kisses his shoe after winning the men's 100-meter final at the 2008 Olympic Games. He topped his own world record, finishing in 9.69 seconds.
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Bolt celebrates next to the scoreboard after winning the men's 100-meter in Beijing.
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Bolt competes in a 200-meter heat at the Beijing Olympics. A few days after winning the 100, Bolt completed the double by setting a new world record in the 200 final. He finished in 19.30 seconds, breaking the record that American Michael Johnson had held since 1996.
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Bolt signs autographs for fans at Toronto's Varsity Stadium in 2009.
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Bolt attends a news conference ahead of the Aviva London Grand Prix in 2009. That year, he broke both of his world records at the World Championships in Berlin. Those records -- 9.58 in the 100, 19.19 in the 200 -- still stand today.
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Bolt kisses his gold medal in 2012 after defending his Olympic title in the men's 200-meter. He also won the 100 again.
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Bolt celebrates after winning 100-meter gold at the 2013 World Championships in Moscow.
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Bolt and children do his signature pose during a track clinic in Tokyo in 2013.
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Bolt celebrates with his mother, Jennifer, after winning 100-meter gold at the 2015 World Championships in Beijing.
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After winning the 200-meter final at the 2015 World Championships, Bolt was accidentally knocked over by a cameraman on a Segway. Neither man was hurt, however, and they later shook hands on the medal stand.
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Bolt dances during a 2016 news conference in Rio de Janeiro.
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Bolt arrives at the Olympic Stadium in Rio to compete in the men's 100-meter. He won the event for the third straight Olympic Games.
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Bolt celebrates with fans after winning the 200-meter at the 2016 Olympics. In Rio, Bolt completed an unprecedented "triple-triple": three straight Olympic golds in the 100-meter, the 200-meter and the 4x100 relay. In 2017, Bolt was stripped of his 2008 relay medal after it was confirmed that teammate Nesta Carter tested positive for a banned substance.
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In what was his final 100-meter race before retirement, Bolt finished third in the final of the 2017 World Championships. American Justin Gatlin finished first but bowed down to Bolt after the race.
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Bolt does a forward roll as he pulls up with a cramp in the final of the 4x100-meter relay during the 2017 World Championships.
