The Inner Game of Tennis: The Classic Guide to the Mental Side of Peak Performance

"Self 1" and "Self 2" battle for dominance in carrying out tasks. One is the conscious self. The other is the subconscious. Instruction usually focuses on the conscious. However, it is the subconscious that must complete the task. 

The book is a mix of tennis-specific advice within a general framework. In tennis, the racquet is an extension of the body. If we try to focus our mind too much on the mechanics, we will fail. Instead, we should picture the general goal. Visualize the result in our mind and then let our body flow through the motions to achieve. Repeat the desired actions rather than think of the detail. This can be applied to specific areas of tennis as well as other aspects of life.