21 Personnel
What is 21 personnel in football?
21 personnel is an offensive grouping with two running backs, one tight end, and two wide receivers. The second back is traditionally a fullback or an H-back, which makes 21 personnel the foundation of the classic pro-style offense and the package most associated with downhill, gap-scheme running.
What the second back does
The fullback is a lead blocker on plays like iso and power, a kick-out blocker on counters, and a receiving threat on play-action in the flat. Modern offenses often use an H-back instead, a hybrid tight end who can align in the backfield, on the wing, or in-line, so the same 21 personnel grouping can present several different looks without substituting.
Why 21 personnel is making a comeback
As defenses got lighter and faster to handle spread offenses, some programs went the other way. Two-back sets put a bigger body in the box, force nickel defenses to tackle, and set up play-action against safeties who have to respect the run. Teams with a deep backfield also use 21 personnel to get their two best backs on the field together.
The 21 personnel depth chart
A 21 personnel chart has QB, two backs (RB and FB or H), a Y tight end, X and Z receivers, and the five linemen. Depth at fullback and H-back is usually thin, so this is the package where walk-ons and converted linebackers show up on the two-deep.
Frequently asked
- How many receivers are in 21 personnel?
- Two. Two running backs and one tight end fill three of the five skill spots, leaving two wide receivers.
- What is the difference between 21 and 12 personnel?
- Both have two receivers. 21 personnel uses two backs and one tight end, while 12 personnel uses one back and two tight ends.