Internet! I have a problem.
The distances of my long runs are cranking up. Saturday, I ran 17 miles. (As I was running, I kept thinking I had to do 18, probably since that was one of the big distances I ran in training last year. Then I'd remember, "Oh, I only have to do 17. So no big deal." That goes to show you just how warped your brain gets in marathon training, since you think things like that while 17 miles is no big deal, 18 is somehow a more significant challenge, when actually it'd be tacking on well under 15 minutes to the time on my feet. Also, this is a long parenthentical thought.)
Physically, I felt fine. I continued to develop the world's largest blister on my left foot, but other than that and desperately needing a shower, I was in fine shape.
The problem was, after a while, the running started to feel monotonous. I lost focus, and allowed myself to take walk breaks that I honestly didn't need, just to mix things up a bit.
Does anyone have any advice on how to retain focus on a long run?