Error: The act of unsuccessfully returning a ball during play.

Eyeguard: a protective device worn over the eyes to prevent injury.

Exchange: The rally, the playing of alternating shots.

Face: The hitting surface of the racquet, the plane formed by the racquet strings.

Fault: An illegal serve hitting the ceiling, backwall, or two sidewalls before the floor, or failing to carry over the short line.

Fish: label given to any person that can be easily score upon and/or beaten; an easy racquetball victim.

Five Foot Line: The short, red line on the floor or sidewall five feet behind the short line of the service box. Also called the restraining line.

Flail: Slang term for putting your entire body into your shot.

Floating Center: Theory of shot coverage developed by Bloomfield and Strandemo to cover over 90% of shots that will carom through a floating center dependent on opponent’s position.

Fly Shot: A shot hit before the bounce, also see cut off shot and volley.

Follow Through: The continuation of the swing after the ball has been contacted. It lends control and direction to the shot.

Foot Fault: An illegal position of the server’s feet during the serve.

Footwork: The act of moving the feet in coordination with the body to a position to hit the ball in an efficient manner.

Forehand: The stroke hit on the same side as the shooting arm.

Freak Ball: When the ball takes an unexpected carom off the walls.

Front and Back Formation: See I-Formation.

Front Court: Area in front of the service line.

Front wall-Sidewall Kill Shot: A kill shot that hits the front wall first and then the sidewall. Also called a reverse pinch shot.