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Henry Schloss says he knew his wife Betsy was the one after the couple attended the GoPro Mountain Games in Vail, Colo., in 2012. “We competed in six races in three days—a 5K, a 10K, a run with our dog Murphy—and she didn’t complain once,” says the Denver-based owner of a printing company. “We’d only been dating three months, but I knew we’d be together forever.”

When the couple met, Mr. Schloss, now 43, was a hard-core ultrarunner, having competed in the Leadville 100, one of the toughest trail races in the country,…