Coach Nana explains how linebackers can identify and recognize offensive personnel groupings by their numerical names, such as "10 personnel" or "21 personnel." The first number indicates the number of running backs, and the second number indicates the number of tight ends. For example, "10 personnel" has one running back and zero tight ends, meaning four receivers. "11 personnel" has one running back and one tight end. "12 personnel" has one running back and two tight ends. Finally, "21 personnel" has two running backs and one tight end. Identifying these groupings is important because offenses often have strong tendencies associated with specific personnel; for example, "21 personnel" tends to run a lot of run plays, while a spread offense often runs tosses, wide plays, or pass plays.
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