Shifts

[daggo66]

Don't add words to the definition. It says: "A shift is the action of one or more offensive players who, after a huddle or after taking set positions, move to a new set position before the ensuing snap."

The running back does not have to wait for the linemen to be set before he goes in motion, however if he does go in motion while they are moving, they (including the RB) must all become set for 1 second before the snap.