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BIRMINGHAM, ENGLAND - FEBRUARY 21:  Kim Collins of St Kitts & Nevis runs in the 60m heats during the Sainsbury's Indoor Grand Prix at the Barclaycard Arena on February 21, 2015 in Birmingham, England.  (Photo by Richard Heathcote/Getty Images)
BIRMINGHAM, ENGLAND - FEBRUARY 21:  Kim Collins of St Kitts & Nevis runs in the 60m heats during the Sainsbury's Indoor Grand Prix at the Barclaycard Arena on February 21, 2015 in Birmingham, England.  (Photo by Richard Heathcote/Getty Images)

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    This 40-year-old can run 100m in less than 10 seconds

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This 40-year-old can run 100m in less than 10 seconds

Kim Collins is the only 40-year-old to run a sub-10 second 100m dash. CNN found out the secret to his longevity and his hopes for Rio 2016.

This 40-year-old can run 100m in less than 10 seconds

Kim Collins is the only 40-year-old to run a sub-10 second 100m dash. CNN found out the secret to his longevity and his hopes for Rio 2016.