Definitely just to finish. The idea of actually doing a marathon didn't pop into my head until the inaugural Columbus marathon but I didn't act on that impulse until three weeks before the 2nd running. I went out for a run to see how far I could go, that was 17 miles and based on that I felt I could finish. I felt as confident as one could expect considering my experience and preparation. It ended up being the easiest of my 19 marathons.