Anyone hook up with a woman you first met on a training run, or at a race? Seems like the thing to do, right? You can judge your physical attraction to her, and you know she's at least somewhat healthy. At a bar, in the dark, all you can tell is that she likes to drink.
The problem nowadays is that almost all women run with an mp3 player - even in traffic, which is so dumb - making any kind of conversation/approach awkward to impossible.