You could buy a copy of The Brave Athlete and begin solving 13 of the most common sports psychology problems that confront athletes, or you could buy each of these books!
Either way, these are the books Dr. Simon Marshall recommends for improved brain training.
Performing Under Pressure: The Science of Doing Your Best When It Matters Most
Dr. Hendrie Weisinger, & J.P. Pawliw-Fry
Thinking Fast and Slow
Man’s Search for Meaning
How Bad Do You Want It?
Hope and Help for Your Nerves
Willpower: Rediscovering the Greatest Human Strength
Roy F. Baumeister and John Tierney