What are the requirements of cross-country skiing for the competition venue?

Cross-country skiing is a sport that uses skiing tools and basic techniques, such as climbing, downhill, turning and sliding, to slide on hills and snow. It originated in northern Europe in the13rd century and is the most basic traditional snowfall activity. Biathlon and nordic combined are derived from this. Cross-country skiing includes two technical movements: traditional technique and free technique. Among them, the traditional technical competition venues need to suppress special snow troughs. Athletes put their skis in the snow slot and support the poles to move forward by swinging their legs back and forth.

The uphill, downhill and flat distance of the cross-country skiing competition route account for one-third of the whole journey respectively. The forms of athletes' departure include intermittent departure and collective departure. Among them, the intermittent start is to start an athlete every 30 seconds, and the athlete who reaches the finish line in the least time wins; Starting in groups means that all the players start at the same time, and the player who reaches the finish line first wins. The site is surrounded by mountains, and the terrain is hilly, with one-third of uphill and one-third of downhill. When choosing a cross-country skiing venue, the quality and quantity of snow should be considered.

The snow surface shall be tamped mechanically or manually with a thickness of at least 10cm. It is best to open a snow trail on one side of the line. The distance between the inner walls of the two snow troughs is 15~ 18cm, and the depth of the snow troughs is at least 2cm. The width of the snow slot depends on whether the snowboard holder will not hit the snow walls on both sides. The ground snow surface of the line is 2cm lower than the pole snow surface or at the same height, and there is no snow trace on the other side of the line. In cross-country skiing, women's double chase actually uses two techniques of cross-country skiing, traditional technique and freestyle technique. Participants first slide the traditional technology out of 7.5 kilometers, then change their equipment, then slide the freestyle technology out of 7.5 kilometers, climb a hill, make a sharp turn, and then set off collectively. The fastest runner wins.

This project is a very challenging exercise for physical health, endurance and physical coordination. Technical movements are usually one-step alternation, two-step alternation and synchronous advancement. Both feet must slide in the snow slot in an alternating posture, and the two skis should be kept parallel to the sliding direction. The technical action of freestyle is to step on the ice and climb the mountain in eight words. The appearance of feet is eight, similar to skating posture. Freestyle is usually faster and more labor-saving than traditional swimming.