Which Winter Olympics requires the contestants to lie down?

Bobsleigh asked the contestants to lie down.

Bobsleigh is a kind of movement that rides or lies on the sled and changes the body posture to control the sled to turn and slide at high speed. Athletes sit on the sledge, push back with their hands with the help of the starting railing to start the sledge. In the process of sliding, the athlete lies on his back on the sled, pulls the sled belt with one hand, and controls the sled by changing his body posture to make it slide down the ice track quickly. When reaching the finish line, the athlete must be on the sled, otherwise the result will be invalid. Single person needs to skate 4 times, double person needs to skate 2 times, and the results add up. Finally, the one with less time wins.

match

The single event is to add up the records of two days and four slides, and the double event is one day 1 time. Team relay is carried out by adding up the records of one day 1 slide, and the timing is accurate to one thousandth of a second.

The length of the race track 1000~ 1500m, the height difference 10~ 130m, from 13~ 16, with an average inclination of 9 ~1/kloc-. The whole slide is u-shaped. In order to prevent the sled from getting off the track, the height of retaining walls on both sides of the slide should not be less than 50cm.