In order for muscles to grow, they need to tear a tiny bit. When the body repairs those muscles, it adds a little extra muscle. That’s why they grow when you exercise.
Running, then resting, allows your muscles to recover. They may not necessarily tear a little bit; after the rest, it’s like you’re starting over.
Running two miles puts stress on the muscles without letting them recover. This “tears” them more, allowing them to grow even stronger.
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