You get sore muscles when you train, because you muscle strings rip and when they heal, your muscles grow. As far as I know. So why and how do they shrink?
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Your body doesn’t actually like having that much muscle; muscle is expensive to maintain, both in terms of energy, and nutrients. It’s very antisurvival to have more muscle than necessary.
Because of that, if you don’t use muscle for a while, your body won’t find it necessary to repair them; they’re dead weight so to speak. It’ll just break the muscle down, and reabsorb whatever’s left as salvage.
The reason we aren’t all shriveled boney husks is because exercise simulates protein synthesis. You use your muscles, your body reinforces them because it’s in your best interest.
Tldr: Your muscles are always breaking down; it’s just that exercise simulates muscle creation to counteract it.
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