Sport is any competitive physical activity or game. It aims to use and improve physical ability through participation. There are hundreds of sports involving anywhere from two to hundreds of participants competing individually or in teams. Sports are generally recognized as physical activities governed by rules to ensure fair competition. Winning is determined by physical events like scoring goals or crossing a finish line first, or by judges' scoring of elements like technical performance. Organized sports keep records of performances that may be widely reported. Sport is also a major source of entertainment for spectators. The global sporting industry was worth up to $620 billion as of 2013 according to estimates.