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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Muscle naturally degrades, but when you work out or use your muscles regularly, you are promoting protein synthesis. If you work out enough you are synthesizing protein at a faster rate than it’s degrading . But when you are sedentary they degrade faster than you can synthesize them. *why* this happens is not entirely understood and there are many contributing factors
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