Duncan Callahan had his doubts about whether he could win for a second time at this month’s Leadville 100 — he had some extremely stiff competition. Halfway through the race, Duncan was behind leader Tony Krupicka by more than an hour. That’s when something unexpected happened. An interview with two-time Leadville champ Callahan, today on Endurance Planet. This episode is brought to you by 2tomsaustralia.com.