I, too, have never ran in my life. I always said that if you see me running, then something is chasing me.
I used to be a ballet dancer, and still feel in my heart the freedom it brought me when on the stage. Now I have two kids and been fat and happily married for 10 years and let myself go. But no more! Just finished day 2 today and it hurt like hell was reaching up from underground, but I did it.