Finswimming: Athletes who swim like mermaids
2 April 2011 Last updated at 10:32 BST
They can swim faster than Olympians Rebecca Adlington and even Ian Thorpe, albeit with a little help and are competing in the British championships.
Finswimming is attracting a growing number of youngsters into the sport, perhaps because this is the closest you get can get to being a mermaid.
Mike Bushell reports.