If pain is a mechanism to know when to avoid a behavior/ when something is wrong, why does exercising hurt?
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Because for the vast, vast majority of human existence (and the totality of that of basically all other animals) the problem was not having enough food rather than having too much.
Exerting lots of physical effort is strenuous and unpleasant because it encourages us to conserve energy. In the modern era, where food is plentiful, this instinct serves us poorly.
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