Not completely reaeltd, but physical health of students in China/Russia (and maybe most Communist flavour countries) is much better than the rest. That helps tremendously in sports events. Students are expected to participate in sports and/or music courses compulsorily from primary through undergrad. The students need to practice and prear end the courses (be able to run 5K in under 20m for example), they're not mere sit-in kind of courses. (That is if a student fails in running, it'll be added to his backlog. He won't finish his schooling until the backlog is cleared.)