Scientists at Stanford University have analysed 68 million days' worth of data from people's smartphones to study physical activity on a global scale.
More than 700,000 people across 46 countries were part of the study, published in the journal Nature, whose activity on the Argus fitness app was monitored.
Hong Kong was the most active of the countries by step count (an average of 6,880 a day) and it also had the smallest 'activity inequality' (a score of 22.2).
'Activity inequality' was the difference in activity between the fittest and the laziest.
By 'activity inequality', China placed second (24.5), followed by Sweden (24.6), South Korea (24.7), and the Czech Republic (24.8). The UK ranked 36th by this measure with a score of 28.8.
Saudi Arabia was the least equal by activity, with a score of 32.5.
In terms of average step count, the UK ranked 12th, with an average 5,444 steps.
Indonesia ranked last for step count (3,513), while Saudi Arabia placed second-last (3,807).
Scott Delp, a professor of bioengineering and one of the researchers, told the BBC:
The study is 1,000 times larger than any previous study on human movement.
There have been wonderful health surveys done, but our new study provides data from more countries, many more subjects, and tracks people's activity on an ongoing basis.
This opens the door to new ways of doing science at a much larger scale than we have been able to do before.
The data was published in full here and on GitHub.