The more miles you drive a car, the more prone it is to breaking down or having mechanical issues. I’m struggling to see how constant exercise like daily 5 mile runs doesn’t add “wear and tear” to the body.
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Basically, humans evolved in a way which means that our joints (and other bodily functions) are coupled with the idea that we get alot of movement each day. Our joints degrade when we dont use them. When we do, they stay “fresh” and “in shape”. If we use them just enough but not too much, they will both get enough movement to maintain full function while also not getting damaged too much to be beyond repair. The perfect balance of daily activity is one where the body gets stressed, but not too much so. Similiarly, exercise actually CAN destroy the body. Lifting too often will damage your muscles as they cannot recover quick enough. Lifting too much will wear your joints down faster than they can adapt and regenrate. Stressing your bones too much (martial arts as example) will cause them to break instead of causing micro-fractures, which heal and strengthen the bone.
The body is built to withstand and thrive under a certain “load”. If you do too little, the body doesnt get to use all the “functions” it has, and those functions will degrade over time, like joint mobility for example. If you use them too much, they will break down. one good example are shoulder, knee and back injuries in landscaping or construction workers, they are constantly hauling heavy things, holding stuff over their heads when pruning / cutting trees, kneeling down on hard surfaces etc. These are all stresses that exceed what our bodies are supposed to be able to handle (humans in the past didn’t exactly lift bags of concrete to survive) so it will cause the joints to fail faster than in people who are not subjected to such difficult manual labor
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