The first time I ran six miles out and back from my house, I knew I would run a marathon. There was no question in my mind. If I could run six miles, I could run 26.2. It didn’t matter that I had no aerobic base. It didn’t matter that I hadn’t run regularly in over seven years. It didn’t matter that I’d only almost but not quite quit the smoking habit I picked up in college. I signed up for the Chicago Marathon a few days later and trained with one goal in mind: to finish. And finish I did, in somewhere around five hours. It didn’t even occur to me to characterize this time, as “slow” or “fast” or even “around what I expected.” I had no expectations at all. It did not occur to me to calculate my pace, not once while training, not while I was running, and not when I finished. I did take pride in the fact that I ran the whole thing, except for a pit stop at Charity Village at mile 15 to eat a cupcake with the kid I was sponsoring as a charity runner. Since then, I’ve run three more marathons, with goals that ranged from “finish” to “finish faster” to “finish faster than that.” Each of my marathons has spit me up and chewed me out. It’s a brutal race. But I keep doing them, because there is nothing–nothing–like the feeling of finishing something that feels impossible.