FILE - In this Sunday, Aug. 29, 2010 file photo, Denver Broncos quarterback Tim Tebow warms up before a preseason NFL football game against the Pittsburgh Steelers in Denver. Joe Horrigan calls it a “many decades love affair with football.” Readers of his book, “NFL Century,” will call it masterful. New Broncos coach Vic Fangio snipped the annual summer ritual of Denver Broncos veterans giving rookies hideous haircuts. (AP Photo/Jack Dempsey, File)