My thinking is that stretching is both dangerous and useless (but it's pointless to argue, as I noted earlier). Leg endurance certainly matters (although hammy pulls often happen to football players , who should be in good shape, but maybe aren't? Interesting, I've almost never seen one by a basketball player or hockey player--both of whom have to be in good 'sprinting' shape; I have seen it happen to sprinters, who ought to be in great shape). When I watched Ortiz and manny, they warmed up by slow jogging--no stretching. And that's the latest recommendation I've heard. Of course, I say this as one who absolutely never stretches (here goes the 'self-laudatory anecdote' part)--I've been running, playing racket sports, golf, sailing, skating pretty much all my life (or at least, the last 60 years or so). I don't do any of them particularly well, but I've almost never been injured.