Prone to injury , Ponikvar retired from track and field at the age of 22 , one year before his senior season at Stanford University .
Injuries prevented Ponikvar from training all year around and he never completed a full year of track and field competition .
Prone to injury , Ponikvar retired from track and field at the age of 22 , one year before Ponikvar 's senior season at Stanford University .
Injuries prevented Ponikvar from training all year around and he never completed a full year of track and field competition .