size is . There are many arena clubs in the United States, and most major polo clubs, including the Santa Barbara Polo & Racquet Club, have active arena programmes. The major differences between the outdoor and indoor games are: speed (outdoor being faster), physicality/roughness (indoor/arena is more physical), ball size (indoor is larger), goal size (because the arena is smaller the goal is smaller), and some penalties. In the United States and Canada, collegiate polo is arena polo; in the UK, collegiate polo is both. Some of the most important arena polo tournaments held are: The U.S. Arena Polo Championship, a 12-18 goal tournament, is one of the highest levels of fast version of polo competition currently played in the United States. Its history dates back to 1926, where the first tournament was held and won by the Yale University team of Reddington Barret, Winston Guest and William Mui. The Arena Polo Grand Prix held in Argentina, promoted by La Carona Polo Club along with the Argentine Polo Association, was organized for the first time in June 2019, and was the start for the Arena Polo in Argentina. The Arena Polo European Championship. The first tournament of this championship was held in 2015. Alongside the Equestrian Federation of Azerbaijan Republic (ARAF) the tournament was organized by the team of World Polo Polo ponies The mounts used are called 'polo ponies', although the term pony is purely traditional and the mount is actually a full-sized horse. They range from high at the withers, and weigh . The polo pony is selected carefully for quick bursts of speed, stamina, agility and manoeuvrability. Temperament is critical; the horse must remain responsive under pressure and not become excited or difficult to control. Many are Thoroughbreds or Thoroughbred crosses. They are trained to be handled with one hand on the reins, and to respond to the rider's leg and weight cues for moving forward, turning and stopping. A well trained horse will carry its rider smoothly and swiftly to the ball and can account for 60 to 75 percent of the player's skill and net worth to their team. Polo pony training generally begins at age three and lasts from about six months to two years. Most horses reach full physical maturity at about age five, and ponies are at their peak of athleticism and training at around age six or seven. However, without any