Saving Planet Earth - Saving Planet Earth: Running Wild

Five celebrities don their running shoes and travel to Kenya to tackle the Safaricom Marathon, one of the ten toughest marathons in the world, to raise money for the new BBC Wildlife Fund. Taking part in the race of their lives are comedians Jon Culshaw and Les Dennis, former Liberty X singer Kelli Young, TV presenter Michaela Strachan and actor Jeremy Edwards. Also along for the ride is Ruby Wax, who'll be the team's sponge girl. Follow the team as they start their training in London under the watchful eye of Colin Jackson, and the none-too-fulsome support of their celebrity friends including Ricky Gervais and Chris Moyles, and then on to Kenya for the build up, and finally the race itself.