Skiing above Sorfjorden in Lyngen Alps, Norway. Norwegians are the worlds first skiers. In the 1940s there was one place to ski. In Idaho "Sun Valley". I believe it was built for a Sonja Henie Movie in the 1930s, early 40s. Few people tried the slopes. It caught on through movies etc. Sonja Henie - famous Norsk movie star. Winter sports, Skating primarily.
Cross-country skiing involves traversing uphill, downhill and flat terrain on a long pair of skis, and unlike downhill skiing, you can cross-country ski nearly anywhere with enough snow. Although gravity does much of the work for you when downhill skiing, cross-country skiing requires endurance and cardiovascular strength. On average, 30 minutes of cross-country skiing burns nearly 300 calories