Book excerpt: 'Chris was on top of the world. He had fulfilled his dream of winning the Tour de France, the sport's greatest race – but there was always a new challenge around the next corner.' Growing up in Kenya, the young Chris Froome loved cycling so much he built his own bike from spare parts so he could pound the roads in the blazing sunshine. This is the story of how Froome won the Tour de France, the hardest sporting test of them all – not just once, but three times.