流水不腐， 户枢不蠹

流水不腐， 户枢不蠹

liú shuǐ bù fǔ hù shū bú dù

Running water is never stale and a door-hinge is never worm-eaten.; Moving things are unlikely to go bad.; Regular exercises can help a person to keep good health.; Running water does not stink, a moving hinge does not stick.