Running quiets your mind and triggers a natural high that reinforces the habit. A tough workout brings real happiness, making you want to do it again. Eventually it becomes so essential that skipping a day feels wrong.
The more you run, the more you get into a natural meditative state where you're not really thinking about your body. You just, you know, that's that runner's high thing, and it can happen on shorter runs. I think the other thing about running or any kind of physical activity is, especially if it's challenging, by the time you're done, you're like, I'm so happy I did that. It's just such a positive reinforcement to go do it again, right? You know, and then it becomes habit, and when something becomes a habit, that's when it's really like you cannot go a day without doing it.
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