(sorry i'm bad at remember characters' names -- plenty of spoilers here)
I'm a terrible writer. I'm trying to be helpful by being brutal -- and I may change my mind about these things in a couple days, so take it with a grain of salt.
I liked it and read it quickly, but I would classify it as a guilty pleasure -- very much in the same way as yetanotherchick pointed out, it's very similar to reading those sorts of threads on letsrun, you have to be in the sort of mood for mindless frivolity. So I didn't mind too much the double-date scene, it felt pretty typical (and I guess you have to decide if this is what you're going for). I wouldn't consider it to be a "great" book, but it was entertaining.
There are a lot of things that just didn't ring true to me. It felt like it was written by a high school boy. The female character didn't quite seem real. The part where the main guy complains to his girlfriend about getting the kid to like him was a bit ridiculous.
It was very much plot-driven; it felt like I was an outside observer, rather than a participant. The hardness, the difficulty of running, seemed like an afterthought.
One thing I was wondering about:
Has anyone else here done a run where they tried to conceal how hard they were breathing (since, say, the end of high school)? It seems like high school douchery to me, how hard you're breathing is such a trivial thing, let the legs do the talking. If two guys are going to go at it, they go at it so hard that they're breathing hard and dying to see the end of the run. And I was surprised the coach didn't yell at them for it.
My strongest reaction was when I yelled "agh... god DAMN it" at my computer when the new girlfriend told him she'd started seeing another guy.
I can't decide if I like the ending where the guy gave up going to the Olympics. It could have made sense intellectually, and I kind of liked the way it worked -- it was almost clever, but not quite. I just didn't feel it. I'm not convinced that the kid would have a better chance than the older guy, I just have to take the author's word for it. For example, you tell us something like, "He realized he'd been running all of these races on pure strength." Maybe it would have been better to have a first round race where sits and kicks, a second round race where he sits and kicks and almost doesn't make it to the next round because his kick is suspect. And make that knowledge more than just intellectual to the reader -- try to make them feel the pain that he feels when it comes to the sprint, a kick to the balls that he has to fight through. Then maybe for the final he's learned his lesson, he goes balls-out and just barely holds off a late kick for the victory; maybe he's flown under the radar the whole time and they don't take him seriously when he goes out hard for the first lap. I rarely felt pain when reading the race descriptions.
And I realize that in not going to the Olympics he's once *again* doing things for someone else, helping the other guy, pleasing his girlfriend / fiancee by finding a way to spend more time with her. If he were looking out for his own running career, he'd go to the damned Olympics, and who knows how much of a kick he could rebuild between the trials and the games, how could you know if he's hit a plateau?
In conclusion, I would classify it as a romance novel written for men, with running as the backdrop. It's entertaining, I liked it, read it as quickly as it could, but upon reflection I thought it had a lot of problems.