Patterns of play in sports are basically simple strategies based on if-then situations. These patterns are practiced with repetition until they become instinctive, i.e., they happen on the court without thinking. The following Adam Manilla videos provide two examples of patterns of play:
We have covered the split step in a previous post, but it is a really a vital movement on the court which can assist your game in many ways: This training video for learning split step in squash applies equally for racquetball.
This video shows how Rocky Carson practices his racquetball forehand by hitting three fundamental shots: Down the line Cross court Pinch to right front corner