I have been foolish enough to do a few marathons (London, Boston, New York) and attempting my first iron man next year. Though they will never be an easy thing to do. If you train long enough pretty much anyone can finish them. The sense of accomplishment you get is amazing (along with the blisters). Also don't forget to go for a poo before you do it. Many professionals are known to poo themselves while running rather than stopping!
I have been foolish enough to do a few marathons (London, Boston, New York) and attempting my first iron man next year. Though they will never be an easy thing to do. If you train long enough pretty much anyone can finish them. The sense of accomplishment you get is amazing (along with the blisters). Also don't forget to go for a poo before you do it. Many professionals are known to poo themselves while running rather than stopping!