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FORT WORTH, TX - JUNE 08: Four-time Olympic gold medalist Michael Johnson talks with the media during the 'Driven by Fitness' event at Texas Motor Speedway on June 8, 2011 in Fort Worth, Texas.

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FORT WORTH, TX - JUNE 08: Sgt. Robert Johnson (L), owner of the Elite Boot Camp, and four-time Olympic gold medalist Michael Johnson (R) present Ryan Brisco, driver of the IZOD IndyCar #6 IZOD Dallara Honda, with a trophy after he won the 'Driven by Fitness' event at Texas Motor...

Getty Images 8 months ago

FORT WORTH, TX - JUNE 08: Ryan Brisco (L), driver of the IZOD IndyCar #6 IZOD Dallara Honda, gives a pair of driving shoes to four-time Olympic gold medalist Michael Johnson (R) during the 'Driven by Fitness' event at Texas Motor Speedway on June 8, 2011 in Fort Worth, Texas.

Getty Images 8 months ago

FORT WORTH, TX - JUNE 08: Four-time Olympic gold medalist Michael Johnson (L) talks with SGT Robert Johnson, IZOD IndyCar drivers Ryan Brisco, Will Power, J.R. Hildebrand and Texas Motor Speedway President Eddie Gossage during the 'Driven by Fitness' event at Texas Motor Speedway on June...

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FORT WORTH, TX - JUNE 08: Four-time Olympic gold medalist Michael Johnson (R) rides in a two-seated IZOD IndyCar at Texas Motor Speedway on June 8, 2011 in Fort Worth, Texas. Johnson participated in a 'Driven by Fitness' event with IZOD IndyCar drivers J.R. Hildebrand, Ryan Brisco, and...

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PERTH, AUSTRALIA - MAY 28: Michael Johnson of the Dockers looks to pass the ball during the round 10 AFL match between the Fremantle Dockers and the St Kilda Saints at Patersons Stadium on May 28, 2011 in Perth, Australia.

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MONACO - MAY 27: Michael Johnson attends the AmberLounge Fashion Monaco 2011 on May 27, 2011 in Monaco, Monaco.

AP Photo 9 months ago

Arizona Gov. Jan Brewer, middle, playfully jokes as she tries to wave away the dust, as Phoenix city council member Michael Johnson, left, and Arizona Secretary of State Ken Bennett laugh along with the governor, during a ceremony for the groundbreaking for the new Centennial Way to...

AP Photo 9 months ago

Four-time Olympic gold medalist Michael Johnson speaks to high school track athletes at the Spire Institute in Geneva, Ohio, Wednesday, May 4, 2011. Johnson earlier announced he was bringing another Michael Johnson Performance training center to the facility.

AP Photo 9 months ago

Four-time Olympic gold medalist Michael Johnson, left, walks with an unidentified people on the indoor track at the Spire Institute in Geneva, Ohio, Wednesday, May 4, 2011. Johnson earlier announced he was bringing another Michael Johnson Performance training center to the facility.

AP Photo 9 months ago

Former Olympic sprinter Michael Johnson talks about his planned training center at the Spire Institute in Geneva, Ohio Wednesday, May 4, 2011.

Reuters Pictures 9 months ago

Michael Johnson (L) carries items handed to him by his girlfriend Shakira Hubbard as they clean out Hubbard's grandmother's tornado damaged home in Pratt City, Alabama, May 1, 2011. Top government officials planned to survey the devastated landscape left by tornadoes in the South on May...

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PERTH, AUSTRALIA - APRIL 25: Michael Johnson of the Dockers handballs against Jarrad Grant of the Bulldogs during the round five AFL match between the Fremantle Dockers and the Western Bulldogs at Patersons Stadium on April 25, 2011 in Perth, Australia.

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PERTH, AUSTRALIA - APRIL 02: Michael Johnson of the Dockers gathers the ball during the round two AFL match between the Fremantle Dockers and the Geelong Cats at Patersons Stadium on April 2, 2011 in Perth, Australia.

Getty Images 11 months ago

BRISBANE, AUSTRALIA - MARCH 26: Michael Johnson of the Dockers and Matthew Leuenberger of the Lions compete for the ball during the round one AFL match between the Brisbane Lions and the Fremantle Dockers at The Gabba on March 26, 2011 in Brisbane, Australia.

AP Photo 8 months ago

In this Tuesday, June 7, 2011 photo, Cincinnati Bengals linebacker Michael Johnson lifts weights during a player-organized practice at Ignition athletic facilities, in Mason, Ohio.

Getty Images 9 months ago

LONDON, ENGLAND - MAY 23: Laureus World Sports Academy Member American sprint star Michael Johnson pictured during the launch of a new partnership between the Laureus Sport for Good Foundation and Track Academy at Willesden Sports Centre on May 23, 2011 in London, England. Connie...

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LONDON, ENGLAND - MAY 23: Laureus World Sports Academy Members Lord Sebastien Coe, Chairman of the London Organising Committee for the Olympic and Paralympic Games (LOCOG), American sprint star Michael Johnson and five times Olympic Golf Medal rower Sir Steve Redgrave teamed up today...

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CINCINNATI, OH - CIRCA 2010: In this handout image provided by the NFL, Michael Johnson of the Cincinnati Bengals poses for his 2010 NFL headshot circa 2010 in Cincinnati, Ohio.

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PERTH, AUSTRALIA - APRIL 25: Brian Lake of the Bulldogs together with Michael Johnson and Antoni Grover of the Dockers contest a mark during the round five AFL match between the Fremantle Dockers and the Western Bulldogs at Patersons Stadium on April 25, 2011 in Perth, Australia.

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PERTH, AUSTRALIA - APRIL 25: Barry Hall of the Bulldogs kicks the ball out of the reach of Michael Johnson of the Dockers during the round five AFL match between the Fremantle Dockers and the Western Bulldogs at Patersons Stadium on April 25, 2011 in Perth, Australia.

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PERTH, AUSTRALIA - APRIL 25: Justin Sherman of the Bulldogs stands on the mark for Michael Johnson of the Dockers during the round five AFL match between the Fremantle Dockers and the Western Bulldogs at Patersons Stadium on April 25, 2011 in Perth, Australia.

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PERTH, AUSTRALIA - APRIL 17: Aaron Edwards of the Kangaroos tackles Michael Johnson of the Dockers during the round four AFL match between the Fremantle Dockers and the North Melbourne Kangaroos at Patersons Stadium on April 17, 2011 in Perth, Australia.

AP Photo 9 months ago

Virginia Gov. Bob McDonnell, left, meets with tornado survivors Kara Johnson and Michael Johnson Friday, April 29, 2011 in Glade Spring, Va. Gov. McDonnell visited the area that was hit hard recently by a tornado. McDonnell said he was going to ask President Barack Obama for a federal...