BMX Biking Pictures

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  BMX rider Luke Madill, who is currently ranked fifth in the world, pauses to talk to a journalist on a purpose-built track in his back yard in Sydney's western suburbs in this March 25, 2008 file photo. Madill has built a remarkable full-size replica of the Olympic BMX (bicycle motocross) track in his backyard to ensure he leaves no stone unturned in his bid for Beijing glory. To match feature OLYMPICS/CYCLING-AUSTRALIA REUTERS/Tim Wimborne/Files (AUSTRALIA)

  Reuters

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  BMX rider Luke Madill, who is currently ranked fifth in the world, flies over a jump on a purpose built track in his back yard in Sydney's western suburbs in this March 25, 2008 file photo. Madill has built a remarkable full-size replica of the Olympic BMX (bicycle motocross) track in his backyard to ensure he leaves no stone unturned in his bid for Beijing glory. To match feature OLYMPICS/CYCLING-AUSTRALIA REUTERS/Tim Wimborne/Files (AUSTRALIA)

  Reuters

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  BMX rider Luke Madill, who is currently ranked fifth in the world, flies over a jump on a purpose built track in his back yard in Sydney's western suburbs in this March 25, 2008 file photo. Madill has built a remarkable full-size replica of the Olympic BMX (bicycle motocross) track in his backyard to ensure he leaves no stone unturned in his bid for Beijing glory. To match feature OLYMPICS/CYCLING-AUSTRALIA REUTERS/Tim Wimborne/Files (AUSTRALIA)

  Reuters

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  BMX rider Luke Madill, who is currently ranked fifth in the world, flies over a jump on a purpose built track in his back yard in Sydney's western suburbs March 25, 2008. Madill and his father Roger built the Olympic length BMX track, complete with an 8-metre-high (26 feet) start ramp, so he can prepare for the 2008 Olympic games on a course that resembles the track riders will compete on in Beijing. REUTERS/Tim Wimborne (AUSTRALIA)

  Reuters

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  BMX rider Luke Maddill, who is currently ranked fifth in the world, flies over a jump on a purpose built track in his back yard in Sydney's western suburbs March 25, 2008. Madill and his father Roger built the Olympic length BMX track, complete with an 8-metre-high (26 feet) start ramp, so he can prepare for the 2008 Olympic games on a course that resembles the track riders will compete on in Beijing. REUTERS/Tim Wimborne (AUSTRALIA)

  Reuters

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  BMX rider Luke Madill, who is currently ranked fifth in the world, flies over a jump on a purpose built track in his back yard in Sydney's western suburbs March 25, 2008. Madill and his father Roger built the Olympic length BMX track, complete with an 8-metre-high (26 feet) start ramp, so he can prepare for the 2008 Olympic games on a course that resembles the track riders will compete on in Beijing. REUTERS/Tim Wimborne (AUSTRALIA)

  Reuters

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  BMX rider Luke Madill, who is currently ranked fifth in the world, practices on a purpose built track in his back yard in Sydney's western suburbs March 25, 2008. Madill and his father Roger built the Olympic length BMX track, complete with an 8-metre-high (26 feet) start ramp, so he can prepare for the 2008 Olympic games on a course that resembles the track riders will compete on in Beijing. REUTERS/Tim Wimborne (AUSTRALIA)

  Reuters

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  BMX rider Luke Madill, who is currently ranked fifth in the world, flies over a jump on a purpose built track in his back yard in Sydney's western suburbs March 25, 2008. Madill and his father Roger built the Olympic length BMX track, complete with an 8-metre-high (26 feet) start ramp, so he can prepare for the 2008 Olympic games on a course that resembles the track riders will compete on in Beijing. REUTERS/Tim Wimborne (AUSTRALIA)

  Reuters

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  Prolific American BMX supercross track designer Tom Ritzenthaler stands on the top of the first jump off the eight-metre tall starting ramp at Olympic the training course in Chula Vista, California March 12, 2008. The track at the U.S. Olympic Training Center is a close replica of the daunting circuit to be used for the Beijing Games. Picture taken March 12, 2008. To match feature OLYMPICS/CYCLING-BMX REUTERS/Mike Blake (UNITED STATES)

  Reuters

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  U.S. BMX Supercross champion Donny Robinson trains at the U.S. Olympic Training Center in Chula Vista, California March 12, 2008. Short of spending the entire year living in China, the 24-year-old Robinson along with his national squad team mates, has been training on a track at Chula Vista, California which is a close replica of the daunting circuit to be used for the Beijing Games. Picture taken March 12, 2008. To match feature OLYMPICS/CYCLING-BMX REUTERS/Mike Blake (UNITED STATES)

  Reuters