"Hard Knocks" is the popular HBO documentary series that follows an NFL team through training camp and preseason every year. A lot of teams are not into doing the show, but for some, they have no choice.
If you have not been on "Hard Knocks" in the last 10 seasons, do not have a brand new coach, and have not been in the NFL playoffs in the last two seasons or more, the league can force you to be on the show.
The teams that can currently be forced to participate are the Baltimore Ravens, Chicago Bears, Cleveland Browns, Indianapolis Colts, New Orleans Saints, Philadelphia Eagles, Tampa Bay Buccaneers and Tennessee Titans. This could change if any of these teams decide to fire their coach because they would have a new coach next season and wouldn't have to participate.
There is always a chance that any team could volunteer to do it, but that usually doesn't happen.
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