Earlier this month, Philip Furrer wasn’t sure what his summer held. Sure, the Swiss cross-country ski racer knew he’d be training and spending three weeks with military recruits for Switzerland’s army requirement. At least he was a sports instructor for the mandatory period. Otherwise, work was winding down. Throughout spring, the 28-year-old from Andermatt, Switzerland, taught primary students in grades 1-6. When he wasn’t racing or traveling across the globe, Furrer, who started in four...