夏のあいだに盛んに行われるスポーツは水泳。それも、海や湖のようなオープンウォーターが舞台になる遠泳やトライアスロンは夏の風物詩だ。見ている方は楽なものだが、泳ぐ人たちは大変。ジグザグ泳ぎになると、タイムが遅くなるうえ体力も消耗する ...

If you regularly swim laps in a pool, chances are that you wear goggles so you can follow the lane markers on the bottom. For triathletes swimming in lakes or the sea, however, there are no lane ...

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