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For the seventh challenge, we headed to the in Middlesex, where Christine Bleakley is training to water-ski across the English Channel for Sport Relief.

Christine's two trainers, Steve Glanfield and Greg Whyte, were on hand to teach Chris and Jonny the basics. After the boys had mastered the art of staying upright, they both took on a special water course to see how much they'd learnt and who was the best overall water-skier.