This is right. The body has all kinds of mechanisms that use inflammation to repair and reshape. Exercise channels this into breakdown and strengthening of musc

This is right. The body has all kinds of mechanisms that use inflammation to repair and reshape. Exercise channels this into breakdown and strengthening of muscles, blood vessel enlargement, and a host of other beneficial tissue manipulations. Making sure you're adequately hydrated is important, as is supporting the cellular activity with nutrition. Where things go off the rails is when the body spends excess energy and inflammatory responses on things not connected to repair and replenish operations. You get acid reflux, allergies, tumors, even dementia-related diseases. Of course it's not that simple, but for nearly every single one of those pathologies, exercise improves the chances to avoid them, or helps reduce their negative outcomes. (IANA doctor either.)