Wang Lishu, 52, was the second fastest runner in the 50+ age group during last year's race. [Photo provided to chinadaily.com.cn]

Stair climbing, first called "vertical races" in the 1970s, is now a global sport with stair climbing clubs hailing from the US, Canada, Europe and Asia, as well as professional athletes who train year-round to be the first to reach the top of the world's tallest buildings.

Although still a relatively new sport, stair climbing has quickly caught on with fitness enthusiasts attracted not only by the physical demands of this grueling sport but also by the novelty of competing in unique urban settings.

For registration, visit chinaverticalrun.com/Beijing.