The celebrities are lured into a false sense of security when they are taught some basic yoga moves - only to discover they have to adopt one of the poses while balancing on a 20cm beam suspended hundreds of feet above a frozen waterfall. As if that were not bad enough, they then attempt their scariest challenge so far - swimming 20ft beneath a frozen lake. Presented by Holly Willoughby and Lee Mack.

S1 Ep5 60min