Since the premiere of "Hard Knocks" back in 2001, there have been a total of 12 NFL teams that have appeared on the HBO show, and this summer, that number will be moving up to 13.

The selection process for "Hard Knocks" consists of three rules, and at some point, the NFL could eventually run out of eligible teams to put on the show, but luckily for the league, that won't be happening in 2020, and that's because there are five eligible teams for this year's version of the ongoing reality show. 

For those of you who aren't familiar with the Hard Knocks selection process, a team is exempt from the show if any of the three rules below applies to them:

They have a first-year head coach in place 

They have a playoff berth in the past two seasons 

They have appeared on Hard Knocks in the past 10 years

For instance, the Giants don't have to be on the show in 2020 because they'll have a new head coach. The Bears won't have to be on the show because they've made the playoffs in the past two seasons and the Bengals won't have to be on the show because they've appeared on Hard Knocks in the past 10 years.