Snowboarders race down a hill doing jumps, with the fastest two from each heat moving on. In Nordic combined, competitors do ski jumps and are scored, with the highest scorer starting first in a 5k cross-country ski race. In skeleton, riders run down the hill and dive head-first on their stomach in a sled, steering by shifting their body. In biathlon, skiers race multiple laps while stopping twice to shoot targets, facing penalties for missed shots. Curling involves teams taking turns pushing stones toward the center of the rink.