After you lift, your muscles start repairing themselves. When you are doing either cardio or normal aerobic activities, your muscles are being used, but they aren't being exerted to the point of being "damaged."
Your muslces heal a lot when you are idle, but they heal the most when you are sleeping though, that's why sleep is so important.
So, basically, unless you are highly exerting your muscles, they won't be "breaking down."
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