Skiing is a competition in which athletes put skis on the soles of their boots to speed, jump and slide on the snow. The snowboard is made of wood, metal and plastic. Alpine skiing consists of downhill, small turn and big turn (obstacle skiing). Alpine skiing mixed project consists of the above three projects. People are in a standing posture, holding ski sticks and stepping on skis to slide on the snow. "Standing", "board", "snow" and "sliding" are the key elements of skiing.