‘I’m Up for It.’ Alex Hall Is Ready to Be an Olympics Leading Man

As a kid growing up in the Zurich area, Alex Hall, the defending Olympic slopestyle-skiing gold medalist who represents the United States, grew fond of jumping around on skis. But Hall says there weren’t many terrain parks near his home. Hall, his older brother Aldo—a snowboarder—and their buddies needed a place to craft their tricks. So with the blessing of his father Marcus, a professor in the evolutionary biology and environment studies department at the University of Zurich, and mother Elena Conti...