When preparing to play you will need your racquet, a tin of balls, comfortable clothing that allows you to move, and protective glasses. The last item is very important because the game moves at a fast pace and high speeds.
The first thing you need to know about racquetball is that it is different then tennis and squash, so if you have background in those sports it is better to try to start learning with a blank mind. The main noticeable differences are that a racquetball racket is smaller and lighter than a tennis racket. (See diagram 1.1) Also, a racquetball ball is a small rubber ball, usually blue, and there is no net. Racquetball is usually played indoors in rooms that have four walls named the front wall, back wall, and side walls. The main areas designated on the floor are the service box and the receiving line. (See diagram 1.2)
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Next Update February 3rd: Basic Rules