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A monofin is a type of swimfin typically used in underwater sports such as finswimming, free-diving and underwater orienteering. It consists of a single or linked surfaces attached to both of the diver's feet. The diver's appearance is then reminiscent of a mermaid or merman. The arrival of the monofin in the early 1970s led to the breaking of all world records by the end of the decade due to the improved performance possible when used in lieu of bi-fins.〔(【引用サイトリンク】url=http://www.luigiferraro.it/en/finswimming )〕 == Use == To differentiate between the use of monofins and conventional fins, the latter are sometimes referred to as stereo fins or bi-fins. The monofin swimmer extends arms forward, locking hands together, locking the head between the biceps. The undulating movement starts in the shoulders, with maximum amplitude towards the hips, the legs almost don't bend to transfer the movement to the monofin. This technique is called the dolphin kick. By slowly oscillating the surface of the monofin when submerged, divers can generate large amounts of thrust even with small or slow movements. This preserves energy which helps when breathholding (apnea). 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「monofin」の詳細全文を読む スポンサード リンク
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