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Beyond joint issues, running is hard on your body overall. In a discussion with my mom this weekend, she expressed her concerns that it was unhealthy to run marathon distances due to the many damages that it can cause to your body. This led to a discussion of why one would run such distances at all, and more specifically, why I am motivated to run long distances.
For me, distance running is not merely a physical achievement and it's not something I do because it is 'healthy' per say. Rather, distance running is an achievement of willpower, endurance, and self discipline. It took me two hours and ten minutes to run 14 miles, and I spent every minute of that time willing myself to continue. I ran with no iPod, no partner, and really no plan other than to finish it - to not give up until it was done. That's a long time to be with your own thoughts, and a long time put the will of your mind over the will of your body.
Your body wants to quit when it gets tired. It wants that hot shower, soft bed, and blissful rest. You are the one who must choose to run every step. It is a true mastery of one's self.
That is why I run.