Ten metres up, three seconds of flipping, and then a panel of judges decides if your splash was too big.
Fun fact: Platform divers complete up to four and a half somersaults in under two seconds of freefall.
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.