Hinders are called when you or your opponent get in the way of a shot or swing. Hinders are called to prevent getting hit by the ball or with the racquet. In this video, Rocky Carson demonstrates the various types of hinders that can occur during play.
Calling penalty hinders during a racquetball match plays an important part of keeping racquetball a fair and honest game. A penalty hinder does not necessarily have to be an intentional act. There are many types of penalty hinders, but the most common falls under Rule 3.15 (a) Failure to Move.