The One Show S2012E120 - 23/07/2012

The Hairy Bikers join Chris Evans and Alex Jones on the sofa to talk about their transformation into The Hairy Dieters. Anita Rani meets the Real Relay Runners who have been following the Olympic Torch, while Carrie Grant spends a day with the Purple Police - Olympic representatives who keep an eye out for contraband advertising. Michael Mosley finds out what happens when his body becomes dehydrated during intense exercise.