If you don’t exercise you will atrophy. That is, your body will deteriorate and eventually die.
Exercise is stress. As babies we had to learn to stand and walk. If you don’t put yourself under that stress then you will never train the neural pathways from your brain to your muscles which are designed to make your muscles work, and your bones will never be strong enough to support your vertical weight. It’s not automatic, it has to be stressed. It’s a stress to get up and walk. Running is a stress on your body. Like a tree needs the wind to stress it so it can strengthen itself, so moderate exercise is necessary for your body to stay healthy. And exercise needs to be done 3 times per week for 20-30 minutes in order to at least maintain and hopefully improve your level of strength. Yet, if you exercise incorrectly you will hurt your body and even potentially break it, and also teach your nerve pathways the wrong information for your muscles.
The same thing is true for our spirits.
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