Art of 'combative swimming' taught in Japan's swimming pools
8 October 2012 Last updated at 20:31 BST
People in Japan are trying to keep alive the ancient samurai skill of combative swimming.
Taken from a time in the country's past when the warriors were expected to be able to cross stretches of water in their heavy armour, moves are based on samurai fighting styles developed over hundreds of years.
Tom Santorelli reports.