I'm surprised that China scored in the middle of the table. The consensus in this country is that our kids are physically weak, due to the lack of playgrounds in the cities, the education system that heavily centered around exams/tests, and the loaded homework.
When I was a kid in the school, we have to do drills of running for 1~2 kilometers every morning, to "strengthen our mind and body". I hated those running drills especially during the winter with the cold wind cutting at my face, but I guess at least it's useful to keep us fit.