Until now, Norway still holds cross-country marathon skiing every year, which is the same distance as that of scouts. Cross-country skiing is called snow marathon because its longest distance can reach 50 kilometers. What's more, it's like the marathon of the Summer Olympic Games, but there is basically no technical action switching in the marathon, while the cross-country skiing track has uphill, downhill and flat ground, each accounting for about 1/3, and athletes have to switch technical actions all the time on different snow surfaces.
On the flat ground and downhill, athletes breathe heavily and their bodies are fully oxidized to meet the energy demand of sports. This exercise is aerobic. In the uphill and sprint stages, athletes need to explode extreme energy at high speed in a short time to complete technical movements, and the body needs to quickly enter the anaerobic metabolism process. At this time, the sugar in the human body can not be converted into carbon dioxide and water like aerobic respiration, but into lactic acid and alcohol, which is the process of anaerobic respiration. Therefore, cross-country skiing is an alternating sport of high intensity and low intensity. Cross-country skiers are mostly all-around athletes with super endurance and good explosive power.
Have you found that cross-country skiers have two different postures? Sometimes, skiers' skis are in two fixed snow slots. What's more, athletes can only move their skis back and forth, just like running on snow. This is called traditional skiing. On the other hand, if there is no snow slot on the ground, skiers will push the snow backwards in a figure of eight, just like skating on snow. This method is called freestyle skiing. Generally speaking, freestyle skiing is faster than traditional skiing. But traditional skiing is easier to learn, and ordinary people generally learn skiing from tradition.
Cross-country skiing has a long history. From the tools at that time to the Winter Olympics, many of them have a long history like cross-country skiing. I also hope that our Olympic spirit will be passed down all the time.