Runners look to hit world-title heights on steps of Hong Kong's tallest tower
Uphill struggle for tower-running world championships culminates on steps of the ICC
If there is an extreme sport Hong Kong was built for, then it must surely be tower running - racing up the stairs of skyscrapers, from ground floor to rooftop.
This morning, runners from around the world take on the city's tallest building, the International Commerce Centre, the venue for the finale of the Vertical World Circuit championship.
The race is the toughest in the vertical-running calendar and two of the sport's reigning champions are expecting to find it much more physically demanding than other races.
They will be among the elite runners leading the chasing pack of hundreds of fun runners up 82 floors of the ICC. The race is full of tight turns along the 2,120 steps that will take runners to the skyscraper's Sky100 observation deck - and the finishing line.
The professional "sky runners" are expected to finish in a little over 13 minutes.
Australia's Suzy Walsham, last year's world circuit women's champion, has an unassailable lead in this year's championship before the final race. But the 40-year-old is committed to winning. "It's the biggest race that I've done this year," she said.