Kung-fu or gongfu or gung fu (Chinese: 功夫; pinyin: gōngfu) is a term often used by speakers of the English language to refer to Chinese martial arts. It is the art of self-defence and fighting, including without any weapons, as developed in ancient China.
In Chinese, kung fu means "hard work", and it´s not only used for martial arts.
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Kung-fu Facts for Kids. Kiddle Encyclopedia.