Dr. David Knapp is on a mission to run 50 marathons this year -- for a great cause

DENVER - Dr. David Knapp, a professor at Regis University, is driven to run 50 marathons in a little over 11 months.

Knapp is running for a cause.

Watch Arran Andersen's video (above) and learn why this is a man on a mission.   

 

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