After completing ultramarathons across the world, Andre Blumberg noticed no one had linked all four of his hometown Hong Kong's major trails in one multi-day run. So, in 2012, he set himself the challenge. Four trails in four days, in reverse - starting with the 100km Maclehose Trail on day one, the 78km Wilson Trail on day two, the 50km Hong Kong Trail on day three, finishing with the 70km Lantau Trail.
It soon became an annual tradition to run the 298km each Lunar New Year. Year by year, the format was changed and refined. Now, it is a single, non-stop effort, with assistance between the trails but none while running on any of the four routes, with two cut-offs of 60 or 72 hours.