I’ve been getting a lot of questions about what the physical training looks like for what is known as the “toughest adventure race on Earth”, the Red Bull X-Alps. As it says on the X-Alps website: It’s a bold claim – but one it surely deserves. It’s difficult to think of another race that demands such a high level of fitness and technical skill – or lasts so long. The combination of trekking and paragliding is one of the most exciting hybrids to emerge from the ongoing convergence of mountain sports.