They took water skiing, turned it sideways, nicked a few tricks from snowboarding, and called it a sport.
Fun fact: The sport didn't exist before 1985, when someone bolted foot straps onto a surfboard behind a boat.
Someone in Scandinavia once thought skiing wasn't hard enough and decided to add a rifle.
Fun fact: Biathletes ski at heart rates near 180 bpm, then must hit targets just 45 mm wide.