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The following outline is provided as an overview of and topical guide to tennis: Tennis – sport usually played between two players (singles) or between two teams of two players each (doubles). Each player uses a specialized racquet that is strung to strike a hollow rubber ball covered with felt over a net into the opponent's court. == What ''type'' of thing is tennis? == * Exercise – bodily activity that enhances or maintains physical fitness and overall health or wellness. * * Aerobic exercise – physical exercise that intends to improve the oxygen system.〔Concise Oxford English Dictionary (Eleventh Edition)〕 Aerobic means "with oxygen", and refers to the use of oxygen in the body's energy-generating process (the citric acid cycle). * Game – structured activity, usually undertaken for enjoyment and sometimes used as an educational tool. Games are distinct from work, which is usually carried out for remuneration, and from art, which is more concerned with the expression of ideas. However, the distinction is not clear-cut, and many games are also considered to be work (such as professional sports). * * Ball game – a game played with a ball. There are many kinds of ball games, racquet-and-ball games being just one category of them. * Sport – form of physical activity which, through casual or organised participation, aim to use, maintain or improve physical fitness and provide entertainment to participants. * * Racquet sport – a sport in which players use racquets (or rackets) to hit a ball or other object. * * One-on-one sport – * * Competitive sport – sport in which one or more participants or teams compete against one another. The one that is the most successful in achieving the objective of the game or sport event is the winner. * * Team sport – sport that involves players working together towards a shared objective. * * Recreational sport – sport engaged in as a leisure time activity. * * Spectator sport – sport that is characterized by the presence of spectators, or watchers, at its matches. Spectator sports are a form of entertainment. * * Professional sport – sport in which the athletes receive payment for their performance. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Outline of tennis」の詳細全文を読む スポンサード リンク
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