also, you may just want to look into various training techniques. My husband was a cross country and track freak in high school, and he was overtrained and underfed. He'd have a great early season, peak in the first week or two, and then crap out for the rest of the season.
a more balanced training scenario, higher caloric intake (including higher fat intake), would have greatly improved his performance. Not every body is the same, not every body should train the same. Different times of day for training, different milages, different speed work, etc work for different people. So, it's actually hard to train a "team" when running is such an individual sport.
similarly, if you're anywhere between ages 13 and 25, you need more calories than average to both grow (including sexually develop!) and play competitive sports.