The 1981 San Francisco 49ers under Bill Walsh turned football around for coaches and prospective players everywhere.  With only the West Coast Offense in mind, Walsh developed a defensive line that consisted of an odd mix of rookies and veterans.  The ’81 49ers depended on defensemen, Fred Dean, Carlton Williamson, Ronnie Lott, and Eric Wright.  All headed up by a young, specialized offensive line of Joe Montana, Dwight Clark, Randy Cross, and Charle Young.  The four championships won by the 49ers in the 1980s spurred young athletes everywhere to train with the goal of agility, strategic comprehension, and exceptional catching ability.  The ideal qualities of just large, strong, and brute strength were no longer viable in a successful team, a team now needed the likes of Joe Montana and Jerry Rice, quick, intelligent, and lithe.