What it is

In the T formation three running backs line up in a row behind the quarterback, with a fullback in the middle and a halfback on each side, so the shape looks like a letter T.

In a game

The quarterback takes a direct snap under center and hands off quickly. Because all three backs are close together, the defense has a hard time telling which one has the ball.

More detail

It was the dominant formation from the 1940s, and many modern formations descend from it. Variants such as the split-T move the linemen further apart, which creates bigger gaps for the backs and makes it easier for the quarterback to read a defender.

Animated diagram

1. Three running backs stand in a row behind the quarterback, which makes the shape of a letter T.
2. The quarterback takes a direct snap and hands the ball to one of them right away.
3. With all three close together, the defense has trouble seeing who has the ball.