Substitute

The substitute or substitution is the possibility to change one or more players on the same team. Each coach has unlimited substitutions, but they can happen only in deadball conditions. If the snap starts, the performer must wait until the end of the play. Otherwise, its appearance is illegal, leading to too many men on the field penalty. The substitutes must be on the field at the moment of the snap, and all performers who leave it must do it in time.

The coach doesn’t need special reasons to substitute the performers. It just needs to rest or recover. Sometimes, the reason may be medical in the case of the injury.