What to Read???

I am stuck with the predicament of what I should be reading. I recently finished 'Born to Run' by Christopher McDougall and loved it. I can't decide of what to read next. I stare and stare at the stack of library books on my counter.
The ones that are catching my eye most are 'Why We Run: A Natural History' by Bernd Heinrich, 'Outliers' by Malcolm Gladwell, and "Yours Ever: People and Their Letters" by Thomas Mallon. The runner in me wants to read the first. The letter writer in me wants to read the last. I am simply just intrigued by the middle. Some people can read multiple books at the same time but I just am not part of that crowd. And this is why I can't decide...