"3-2-1 Football" can refer to a 3-2-1 tactical formation, a specific practice drill, or a team-building activity. The formation is a defensive-minded setup used in small-sided games that provides numerical advantages in certain areas while creating disadvantages elsewhere. The 3-2-1 drill focuses on passing, receiving, and defensive rotations, while the "three, two, one" activity encourages teamwork and scoring relationships through a point-based goal system.