I've always been fascinated by the process of how coaches become experts, teaching kids an element of a sport that they may have had minimal experience actually playing themselves. For instance, one of the coaches who has a huge rep as a QB "guru" played offensive line in college (Norm Chow); another didn't play in college at all (Charlie Weis). Tennessee's Jim Chaney, who helped groom Drew Brees and has a very specific technical checklist he considers when evaluating QBs, was a college nose guard. Iowa's Kirk Ferentz, regarded as one of the game's top O-line coaches, played linebacker at UConn. Obviously their wisdom wasn't developed overnight or even in weeks or months -- but sometimes, for coaches, it has to be.
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