Polo taken. The official set of rules and rules interpretations are reviewed and published annually by each country's polo association. Most of the smaller associations follow the rules of the Hurlingham Polo Association, the national governing body of the sport of polo in the United Kingdom, and the United States Polo Association. Outdoor or field polo consists of four to eight 7-minute chukkas, between or during which players change mounts. At the end of each 7 minute chukka, play continues for an additional 30 seconds or until a stoppage in play, whichever comes first. There is a four-minute interval between chukkas
Water polo consists of the players swimming to move about the pool, treading water (often using the eggbeater kick technique), passing the ball and shooting at goal. Teamwork, tactical thinking and game awareness are also highly important aspects in a game of water polo. Water polo is a highly physical and demanding sport and has frequently been cited as one of the toughest sports to play. Special equipment for water polo includes a water polo ball, a ball which floats on the water; numbered and coloured caps; and two goals, which either float in the water or are attached to the side