Bill Belichick, the four-time Super Bowl–winning head coach of the New England Patriots, made his way up the ranks of the NFL by loving and mastering the one part of the job that coaches disliked at the time: analyzing film. His first job in professional football, for the Baltimore Colts, was one he volunteered to take without pay—and his insights, which provided ammunition and critical strategies for the game, were attributed exclusively to the more senior coaches. He thrived on what was considered grunt work, asked for it and strove to become the best at precisely what others thought they
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