"Why does it hurt when you laugh hard?

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When someone tells you a joke and you start to laugh really hard, you tense up your stomach muscles and pump your diaphragm up and down. if you keep on laughing you end up with over-exercised stomach and diaphragm and they hurt! but just think some people get the same kind of soreness by doing push-ups at least its more fun to laugh, don't you think so?