Reality TV faves Hugo Taylor and Lucy Mecklenburgh, presenters Angelica Bell and Jodie Kidd, sports personalities Darren Gough, Austin Healey and Amy Williams, and choreographer Louie Spence are all pitting themselves against the unforgiving course.
They've got just eight weeks to get fit, and with so much to learn in such a short time, it's a punishing schedule. As well as team training events, they must clock 25 hours a week in the saddle.
A series of heavy duty fitness tests kick things off, with the sporty types excelling in the early stages. But it's Jodie Kidd who finds herself in the most trouble when an assault course leaves her with a badly injured knee. Will she have to quit?
Tour de Celeb, Channel 5, 7pm
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