Japan's Kohei Uchimura performs on the horizontal bar during men's individual all-around final on Wednesday. Uchimura, widely considered to be the best male gymnast ever, repeated as the gold medalist in the event. Dmitri Lovetsky/AP hide caption

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Dmitri Lovetsky/AP

Russian tennis star Maria Sharapova isn't competing at the 2016 Olympics. At a March 7 press conference in Los Angeles, she told reporters she'd tested positive for meldonium, a prescription heart drug that improves blood flow. It was banned in January by the World Anti-Doping Agency. Robyn Beck/AFP/Getty Images hide caption

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Robyn Beck/AFP/Getty Images

Olympic Athletes Still Use Some Rx Drugs As A Path To 'Legal Doping'

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Jaime Rangel helps Gustavo Ruiz, 12, align a tire on his bike, at a recent community event in southeast Fresno, Calif. As manager for Bici Projects, Rangel promotes cycling in the Latino community as a great way to get in shape. Farida Jhabvala Romero/KQED hide caption

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Farida Jhabvala Romero/KQED

The Eastside Bicycle Club on a 35 mile Saturday evening ride with stops for tacos. Carlos Morales hide caption

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Carlos Morales

On A 'Tour De Tacos' With Los Angeles' Eastside Bike Club

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Britain's Chris Froome gestures to a teammate (right) after getting up from his third crash in two days. Froome, who hurt his wrist in Tuesday's fall, has abandoned the race that he won in 2013. Laurent Cipriani/AP hide caption

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Laurent Cipriani/AP

The women of the Afghan National Cycling Federation team train outside Kabul, the capital. They face poor road conditions, terrible traffic, lots of gawking and even threats of violence in pursuit of their sport. Peter Breslow/NPR hide caption

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Peter Breslow/NPR

Afghan Female Cyclists: Breaking Away, And Breaking Taboos

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Cyclists negotiate rush hour traffic in central London on Nov. 15. Fourteen London cyclists have died so far this year, all in accidents involving heavy goods vehicles. Oli Scarff/Getty Images hide caption

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Oli Scarff/Getty Images

Londoners Urged To Cycle, But Commute Can Be Treacherous

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The head of the World Anti-Doping Agency calls Lance Armstrong's lifetime ban "done and dusted." Armstrong is seen here riding in an event in Iowa this year. Matthew Stockman/Getty Images hide caption

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The incoming president of the International Cycling Union, Brian Cookson (right), shakes hands earlier this month with Pat McQuaid, the incumbent he defeated. Fabrice Coffrini/AFP/Getty Images hide caption

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Fabrice Coffrini/AFP/Getty Images

American cyclist Chris Horner celebrates winning Spain's Vuelta bicycle race Sunday. Anti-doping officials say that Horner, who at 41 is the oldest ever to win one of cycling's top events, was not at the hotel drug testers visited. Jaime Reina/AFP/Getty Images hide caption

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Jaime Reina/AFP/Getty Images

British cyclist Graeme Obree, 48, celebrates setting the land speed record for prone cycling at the International Human Powered Vehicle track near Battle Mountain, Nevada. AFP/AFP/Getty Images hide caption

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Riders and bicycles were spread across the road after one of the crashes Saturday during Stage 1 of the Tour de France, which began in Corsica. Joel Saget/pool /EPA/LANDOV hide caption

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Joel Saget/pool /EPA/LANDOV

The 2013 Tour de France is breaking with several traditions, as it starts with a sprint stage on Corsica Saturday. Here, American Tejay van Garderen, 24, second from left, trains with his team on the island. Laurent Cipriani/AP hide caption

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Laurent Cipriani/AP