I believe exercise damages much of your body in small doses which get stronger after rest. But doesn’t getting sick do the same thing? Shouldn’t you get stronger after getting sick? And if not why do extroverts live longer? Wouldn’t they be exposed to more illness and have decreased lifespan?
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Your strength increases in response to the type of damage done from exercise, under the assumption that you will need to be doing more of it in the future. There’s different chemical signalling going on as a result of exercise that affects this. Practically you don’t actually need to exercise hard enough to cause said damage, and overdoing it gives worse results cause your body also needs to heal.
Increasing strength in response to other types of damage such as that from sickness would just be a waste of resources so your body doesn’t bother.
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