Aravaipa Running, Waddell

You could probably run for three hours on a treadmill, but why would you want to? Brothers Jamil and Nick Coury—named two of the Arizona Republic's top 35 entrepreneurs under the age of 35—provide far more enjoyable running opportunities at the 20 long-distance trail runs they organize each year. They don't pick these courses, which wind through some of the most scenic terrain in Arizona and Colorado, by simply throwing darts at the earth from a helicopter. With more than 80 completed marathons between them, the brothers are experts at spotting the natural features that make for a satisfying run. These include steep inclines, sloping descents, and eye-popping views. Their events give you the chance to gaze on Phoenix from the White Tank Mountain Range or behold Silverton, Colorado, from more than 13,000 feet above sea level.