Cahoots, Midway

As the name implies, Cahoots Duo Challenge's overland obstacle-course races principally challenge teamwork. Pairs of runners—who spend just as much time climbing and crawling as jumping, swinging, and tumbling—rely on each other's strength and wits to complete a series of challenges laid out over a 3- to 4-mile course. Along the way, racers get wet, muddy, and sweaty as they test their endurance or the likelihood that their partner is a golem.