Beautiful shots! Excellent capture of the athletes' effort and emotion. I really like the composition showing peak action with the hurdler against the slightly out of focus spectators. You chose your camera positons well. I might have tried having the subject off center in the third shot to show a bit more of the out of focus trailing runners if possible, but that is one of my favorite shots, that I try to get at every meet that I photograph. Well done.
My son runs track for Morristown (NJ), but he's only a freshman. My second son runs track for the middle school. I'm going to have to start following these track threads because I think I'm going to be taking lots of these.