What makes you go on?

Someone asked me this week what makes you run for two hours.What makes you keep running? I thought about this a lot today while I was running.. My answer is this. What keeps me running is the realization that I can do this. The only thing stopping me is me. I am not tired my lungs are good. I can breathe my legs do not hurt. So why can't I? I have changed so much from the person I was years ago. I am so much stronger. After the bad spot I realized I am strong. Its a shame It took me 36 years to realize this but I guess at least I did. I will never say that time period was good for me but I sure came out the other side a different/better person.