Why are folk masters practicing traditional Chinese martial arts generally out of shape?

I think I appreciate it from a practitioner's point of view. It fits the classical oriental aesthetic, a model of strength and power. As for those martial artists who are lithe, it's possible that this is a result of differences in martial arts forms. It's not unusual to see a difference in size between those who use axes, golden gourds, and great swords, and those who use daggers, swords, and bows. Even in unarmed combat, melee grappling and wrestling are mostly big men, and it's not surprising that those who are concerned with quick strikes and quick take-downs and agile movement have size differences with them. Here only discuss this kind of big man, other not expand. Whether or not a person with this size is a real practitioner, you can see whether his stomach can take a beating, and whether or not his shoulders and arms are strong. If the limbs are thin and the stomach is big, it is mostly fat, and the waist is round only after the bladder is big.