Worst-to-First
In the National Football League (NFL), "going from worst-to-first" refers to a team winning its division the season following a last-place divisional finish. The inverse scenario, in which a team goes from first-to-worst in their division, has also been observed. The NFL's current division alignment has been in place since the 2002 season and sees both conferences–the American Football Conference (AFC) and National Football Conference (NFC)–have four divisions each, for a total of eight in the league. These conferences are mostly based on geography and have names to reflect this (i.e. the AFC East and NFC North).
While the concept is often covered by sportswriters as it pertains to the NFL, teams in other sports leagues have also been documented going from worst-to-first.