Ditto jgl on the older generation of locals ( and some westerners, I have noticed joining in) getting up early, or even during the day to take part in tai chi, fan dancing or walking, hiking. When I lived in the midlevels , I used to hike up the Peak every day, and I would see the usual oldies make it up in no time. One fellow took his radio with. Another guy I spoke to admitted he was almost 80 and even if he was going at it slower than he was ten years ago, he was still walking every day.
Despite the pollution and a culture that centers mostly around eating out, or just plain eating, it's no wonder HKers are living longer than their Asian counterparts.