The only team to play the entire season without any confirmed positive cases did so with innovative thinking, vigilance to protocols and some Pete Carroll-style competition.
The Tennessee Titans and Minnesota Vikings are the N.F.L.’s first teams to halt operations after eight members of the Titans received positive tests.
The return of professional football to a nation living on a raw and perilous edge, struggling to confront a lethal virus and trying to heal its deep racial wounds, offered fans a tense and unlikely paradox.
This week, some N.F.L. teams will have their first organized football activities, even as coronavirus guidelines keep personnel away from team facilities.