Change is everywhere in the NFL. First down becomes second down, and not only on the field. On any given day, at least one of the 32 teams will change its roster, opting to sign a player and release somebody else. A coach can change strategy, adjusting how a team prepares to attack or stop an opponent. A player changes the way he performs a task, opting to square his shoulder as he begins to tackle or adding an extra step before he throws the ball.
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