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.
The Chimp Paradox: The Mind Management Program to Help You Achieve Success, Confidence, and Happiness
Dr. Steve Peters
Performing Under Pressure: The Science of Doing Your Best When It Matters Most
Dr. Hendrie Weisinger, & J.P. Pawliw-Fry
Choke: What the Secrets of the Brain Reveal About Getting It Right When You Have To
Dr. Sian Beilock
Thinking Fast and Slow
Daniel Kahneman
Man’s Search for Meaning
Viktor Frankl
How Bad Do You Want It?
Matt Fitzgerald
Radical Candor: Be a Kick-Ass Boss Without Losing Your Humanity
Kim Scott
Hope and Help for Your Nerves
Claire Weekes
Willpower: Rediscovering the Greatest Human Strength
Roy F. Baumeister and John Tierney
The Power of Habit: Why We Do What We Do in Life and Business
Charles Duhigg