Summary:
- The article discusses the NFL's new criteria for selecting teams to appear on the "Hard Knocks" documentary series, which follows a team's training camp.
- The new rules state that teams can be compelled to appear on "Hard Knocks" if they have a first-year head coach, have made the playoffs in the last two seasons, or have appeared on the show in the last 10 years.
- The Denver Broncos, as a team with a new head coach in Nathaniel Hackett, could be a potential candidate for the "Hard Knocks" series in the upcoming season.