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Peter Rejlers gets fired up when a competitor kicks him in the face in the water during a triathlon. Getting kicked in the face by his race partner? “That isn’t quite as motivating,” he says.
Mr. Rejlers, the 50-year-old CEO of Rejlers AB, a Stockholm-based engineering consultancy, competes in a sport called swimrun. A test of endurance and friendship, swimrun races require teams of two to swim and run between and over islands…