Watch Helen's Polar Challenge for Sport Relief Season 1 Episode 7 Online

It is just day two of Helen's 500-mile Sport Relief trek to the South Pole, and already she is behind schedule. But Helen hopes to make up the miles by using the kites. The extreme conditions of Antarctica are starting to take their toll on Helen as she struggles to get to grips with life in the world's biggest freezer. She is forgetting her polar training and is failing to do the basics, as she finds out she is in danger of becoming seriously dehydrated.