It's a bit like doing the conga, but in a pool! This photograph shows an early morning water exercise class in a swimming pool in Arizona (US). Groups of people form human chains, their hands on each other’s shoulders, the water swirling around them as they move in circles.

The photograph was taken by David Hurn in 2002. David Hurn travelled to Arizona many times. He described it as ‘the most right-wing state in America, plus it is the driest state. The exact opposite of my home country Wales.’