One of the most important shot to practice is the playing the service return off the back wall. In amateur racquetball, most serves will come off the back wall.

Remember our relationship to the walls changes here. Depending on the serve, you generally want to get farther away from the side wall and closer to the back wall. Do not, however, change your basic approach to back wall play. If the serve is above the shoulder, take it back to the ceiling. If it's below the shoulder, go down the line or cross court.  

The key to playing the serve properly is your feet. They have to move. They must get you into position to put the serve in your power zone.

On a serve that hits the side wall, then comes off the back wall (such as a powerful Z), you should set up about 4 to 6 feet from the side wall and 2 to 3 feet from the back wall.
 

How should a serve that slams into the back corners and shoots straight out, no telling which way it's going to go, be approached?

Remember it's easier to move forward than back, so here you want to reverse the situation above and setup 2 to 3 feet from the side wall and 4 to 6 feet from the back wall, allowing enough space to glide forward should the ball take an unexpectedly strong bounce off the back wall.

What shot selection is best for serves that come off the back wall?

Shot selection shouldn’t change. Rather, positioning will need to be considered before accessing shot options. The next step is executing your selection and moving your feet to cover the return (usually center court).

 

Source: Dave Peck Racquetball