Burkhard Martens is one of the most-recognized names in the sport. His seminal work, "Thermal Flying", first published in 2005 is the world’s best-selling guide to the art of thermalling and XC flying. Cross Country’s team has been hard at work thoroughly revising and updating the text, line by line, and the design and photography has been refreshed to bring it bang up to date. I sat down with Burki a few weeks ago to talk about his new edition, what's changed since 2005, and the meat of the book- how to climb!