Chris Evans and Clare Balding bring back the eight celebrities competing in this adrenaline-fuelled live event show for fourth installment of the competition. Broadcasting live from Echo Arena Liverpool, the celebrity contestants compete in a series of urban and extreme sports for the chance to take home £10,000 for their chosen charity. Representing the women are Gold Olympic Medal winner Dame Kelly Holmes, former EastEnders favourite Kacey Ainsworth, actor and Hollyoaks star Sarah Jayne Dunn, and TV presenter and former Atomic Kitten Jenny Frost. Representing the men are New Zealand rugby legend Jonah Lomu, comedian Rufus Hound, adventurer Charley Boorman, and musician and action sports enthusiast Sam Branson. While these C-listers risk their lives partaking in activities like monster-truck racing, BMX riding and demolition derby, another celebrity guest will demonstrate a spectacular one-off stunt. Continues tomorrow and Friday.