Polo is a team sport played on horseback in which the objective is to score goals against an opposing team. Sometimes called, `The Sport of Kings`, it was highly popularised by the British. Players score by driving a small white plastic or wooden ball into the opposing team's goal using a long-handled mallet. The traditional sport of polo is played at speed on a large grass field up to 300 yards long, and each polo team consists of four riders and their mounts. In arena polo, only three players are required per team and the game usually involves more manoeuvring and shorter plays at lower speeds due to space limitations of the arena. The modern game is played on horses. Polo is played professionally in 16 countries. It was formerly, but is not currently, an Olympic sport. There are many Polo centres across the UK to choose from