Official Rules of Racquetball
1.3 - Objective
The objective is to win each rally by serving or
returning the ball so the opponent is unable to keep the ball in play.
A rally is over when a player (or team in doubles) is unable to hit the
ball before it touches the floor twice, is unable to return the ball in
such a manner that it touches the front wall before it touches the
floor, or when a hinder is called.