Hard Knocks is a reality sports documentary television series produced by NFL Films for HBO. First broadcast in 2001, the show typically follows a National Football League (NFL) team through its training camp and covers the team's preparation for the upcoming football season. Beginning in 2021, the show has also dedicated an additional season of television to following an additional team throughout the NFL regular season, followed by an additional season to follow another team through the NFL offseason starting in 2024.