She talks to Olympians and to open-water champions like Lynne Cox to find out why they live to swim, why swimming is man's most sensuous sport (because skin is his largest sensory organ) and why it keeps your arteries elastic, your joints supple, is good for your heart as well as your brain, and offers more than a cursory help in the fight against ageing.

ECONOMIST: Lynn Sherr��s new book offers all the skinny on dipping

At this level, the group can be viewed as a superorganism, with each individual being a sensory and motor organ of the whole, contributing to the well being of the group and sharing vicariously in its collective experience.

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