can endure physical fatique and brutal heat/cold much better than most americans. They may not run for 3 miles or pump muscle, but they eaily walk for miles in 40 C everyday. They don't just exercise for the sake of exercising. They burn a lot of calories in everything they do in their daily life. For example, they carry fresh groceries home everyday, cook, wash cloth, take subway. Even regular walking on the street in China is more demanding because you have to dodge human, cars, scooters constantly running at you. To me, this is real exercise. Not the stupid fit corp stuff.