It has its origin in the activities, such as military parades and sporting competitions such as archery, horse riding and wrestling, which followed the celebration of various occasions, including weddings or spiritual gatherings. It later served as a way to train soldiers for battle, and was also connected to Mongols' nomadic lifestyle. Mongolians practice their unwritten holiday rules that include a long song to start the holiday, then a traditional dance. The cuisine, or Khuushuur, is served around the Sports Stadium along with a special drink made of airag. The three games of wrestling, horse racing, and archery are recorded in the 13th-century book Mongolian Secret History.