Name an extreme sport -- kiteboarding, skiing, snowboarding -- and chances are April and Kerisimasi have tried it together. The couple, both resident physicians living in Berkley, Michigan, met in 2006 at medical-school orientation in California. And though initially drawn to each other, they didn't kindle a romance until two and a half years later. "We became such good friends, we didn't want to risk losing that if it didn't work out," says April. Fortunately, they took the gamble, and...