Eight UK Celebrities are attempting L'Etape de Tour, a gruelling amateur cycling race based on one of the stages from the Tour de France. With just eight weeks to train it's the beginning of the toughest training regime of their lives.
Just six weeks to the Etape, and with many of our celebrities struggling with even the basics, the coaches call in some expert help in the shape of Rio Olympic Gold Medal Winner, Ed Clancy.
Just four weeks to go and it's all getting very serious . The anxious coaches have laid on extra training in the Exmoor Hills but only Olympian Amy turns up.
Our celebrities finally head for Megeve, in the French Alps, and the start line of the toughest mountain stage of the world's most famous bike race, the Tour de France.