I'll throw in my 2 cents. Actually, more like 8 cents, but I think only one of those cents actually matters, and that's the first one.
1) The book isn't near publishable quality. Not near it. I'm sure I'll get flamed for this and dubbed a liar - that's fine - but I've been editing fiction long enough to say this with confidence: the book needs a thorough reworking.
2) It does have potential. Taking a page from Stephen King's On Writing, I'll go ahead and say you have a nice little fossil here. In some places, you uncover your fossil well; in others, you use a sledgehammer when all you need is a damn toothbrush.
3) As some other posters alluded to, I think the main reason it held my attention at all is because it's about running. Like the one guy said, if it was about swimming or something, there's no way I get through it.
4) You're trying to straddle literary fiction and...something else. Something more commercial, maybe? I'm not sure. It makes for an odd blend of things, though. Pick your path, and then stick with it.
If I'm an agent and I get to: "Hence, the problems between them.", I'm already thinking about trashing the manuscript. If I do decide to keep reading, I come upon this odd little bit a few sentences later: "Last night's phone call had bordered on the surreal."
Bam. You're done before your foot is in the door. And that's just from taking a glance at the first page.
I'm not trying to discourage you here, because ultimately you're doing what you should be. And that's writing what you want to write, how you want to write it.
But you aren't there yet. Keep at it.