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I believe anyone can do it. It's not to be underestimated but if you've trained for it (and most of us average Joes do need to train) you'll make it to the finish line unless you suffer an injury or illness.
I was apprehensive before I ran The Marathon* but I think that's natural. I'd never run more than 20 miles and those training runs had hurt. But if you can get to 20 miles, then another 10k is achievable.
*just for rhb ;)
This is interesting. I've realised that I'm really terrified of the distance - I really don't believe I can do it. I know it's a totally random distance and I know that loads of people do it every weekend... but I have the fear. And the fear has really been fed by Sunday's DNF.