This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. (CNN) — So we’ve watched a couple of movies ...

At 5:30 every morning in this gray megalopolis, a kung fu teacher walks to a patch of woods near his studio, to limber up and clear his mind. Whether the dawn air is frigid, smoggy or stiflingly hot, ...