Ever do a marathon?

Has anyone here ever joined in on a marathon? I'm thinking mostly running/jogging. I was in a marathon for my hometown last year, that was to help benefit a local children's hospital. I've never done one before, but it was a great workout, and felt cool to just run with my friends and family.

I am thinking about doing one of the mud runs, as well may even do more obstacle course style marathons. Any suggestions?
I have not yet done a marathon, but there are a few of them every year where I live. A few of my friends do it, and have been asking me to join them for a while now. I'm not really into the idea of running a marathon. I prefer to do my workouts in private where no one can see me.

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