When rules are being followed, optimal learning can take place. When rules are not being followed, learning is compromised and can lead to a classroom environment that is either not safe or not conducive to learning. Obviously we strive to participate in optimal learning conditions which means when rules are not followed, there are a series of consequences in place which are explicitly taught in order to help students learn what is expected of them while in the gymnasium.
The first time a rule is broken, the consequence is almost always a warning (unless it is dangerous or destructive ... then it moves directly to consequence number two). A warning is not a bad thing, just recognition that there is a rule being broken and that it needs to be fixed. It may sound something like this, "John, I need you to make sure that you are using whole body listening on a stop signal. Consider this is a warning"