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With four world titles under his belt—all at short-course racing—37-year-old Tim Don is just getting started. After three Olympic appearances (2000, 2004 and 2008), Don shifted his focus to long course after missing the 2012 team. Under the guidance of coach Julie Dibens, Don is preparing to go after the Ironman 70.3 world title Sunday in Zel am See, Austria. After that, he’ll get ready to compete at the Ironman World Championship for the first time on Oct. 10. In this video, join Don in Boulder, Colo. to learn what it takes to be competitive at the highest level of long-distance triathlon racing.