The Art of Learning by Josh Waitzkin is an entertaining story of his early life as a world-class junior chess player and later competing in Tai Chi Push Hands. The book includes a lot of his ruminations and analysis of mental problems he encountered and how he dealt with them. Well-written and likely to give you some ideas. Also includes some unfortunate stories of corruption and unfairness in other sports that makes any trouble we have in USPSA seem tame by comparison.