Hong Kong's finest adventure athletes (or sadomasochistic nutters, as they have been called) are gearing up this week for the annual Trailwalker event. This adventure race sees thousands of people attempting to run, walk or crawl the 100km Maclehose trail in Hong Kong's New Territories. The quickest will run the course in little over 14 hours while the slowest will take something like 48 hours. It is a gruelling feat of endurance over Hong Kong's hilliest passes and the combined elevation covered in climbing the hills is the same as conquering Mount Everest.