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Butterfly stroke
The butterfly (colloquially among swimmers known as ''fly'') is a swimming stroke swum on the breast, with both arms moving simultaneously, accompanied by the butterfly kick (also known as the "dolphin kick"). While other styles like the breaststroke, front crawl, or backstroke can be swum adequately by beginners, the butterfly is a more difficult stroke that requires good technique as well as strong muscles. It is the newest swimming style swum in competition, first swum in 1933 and originating out of breaststroke.〔(Maglischo Ernest W. ''Swimming fastest'' p. 145 )〕
==Speed and ergonomics==
The peak speed of the butterfly is faster than that of the front crawl, due to the synchronous pull/push with both arms. Yet since speed drops significantly during the recovery phase, it is overall slightly slower than front crawl, especially over longer distances.
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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