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Yes, I read recently that it can lead to some kind of exercise addiction which is caused by an addiction to the endorphins produced by the runner's high. Did you know it? :)

Yes. I'm aware of that. But, having experienced the runner's high myself many times, I can say it's not a bad thing. There are people addicted to exercise who overdo it and become very unhealthy. And, they can't control themselves. Unfortunately, a lot of people also lose their lives because of it.