Elizabeth Gowing is not a likely yogini. She is too fond of cake and To-do lists, and sometimes falls over on her mat. But yoga has taken her on journeys both inside and out and now she follows yoga around Britain - from the village hall where a quivering triangle pose was interrupted by the council recycling collection to a sound gong bath in the country's noisiest city, from Cornwall to Scotland. She discovers prisoners finding solace in child's...