Until I watched Julie & Julia about this weirdo cooking all recipes of Julia whatever (famous cookbook author) in one year and I suddenly thought: this is so self-important. And pathetic. And I just thought what am I doing? Why do I love those silly challenges? Do they make your life feel more in control? I don't know. I certainly think that they totally allow you to forget everything around you that is important. 500 miles per year that means no books, no opera, no cycling?
I don't know. On the other hand they are fun! It is FUN to feel self-important. It is fun to be on a mission. It is fun to feel that you are the main character in some reality TV show about the girl trying every Kamasutra position in one year.
YAY! Go for the challenge!