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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As covered by others, your body is always trying to maximize efficiency and rid itself of unused excesses. So if you build muscle mass through hard work but then back off on the hard work your body thinks it doesn’t need the muscle and it starts to degrade.
Inactivity is the devil when it comes to building and maintaining muscle mass. It can also happen if you aren’t eating enough calories regularly to maintain your weight.
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