NFL, the season is long, and both physical and mental endurance are put to multiple tests.
At the same time, the competition is fierce, with no absolutely strong teams and no absolutely weak teams. The outcome between different teams is often uncertain, especially in the second half of the season when the tests become more severe and the games more challenging.
The evidence is everywhere—
In NFL history, only two teams have achieved the feat of an undefeated regular season.
The 1972 Miami Dolphins, with fourteen perfect regular-season games and winning the Super Bowl, achieving a 17-0 record for the season; the 2007 New England Patriots, with a sixteen-game perfect regular season, but regrettably lost the Super Bowl, finishing the season 18-1.
In NFL history, only two teams have advanced to the Super Bowl three consecutive seasons.
