I’ve been studying Martial Arts for around 30 years on. I’ve gotten a couple of other books by Loren W. Christensen, mostly on training and diet. However Meditation For Warriors: Practical Mediation for Cops, Solders, and Martial Artists is the first one that focused on the mental aspect.
This book is written as a practical guide to focus your mind, giving you a calmer demeanor, and allows you to stay cool, calm, and collected when the stuff hits the fan.
I really like that while it’s geared towards “Warriors” (Police, Soldiers, Martial Artists), it’s a really down to earth book that anyone could read and get a better understanding of meditation. Part of the goal of the book was to give non-practitioners a real world view of the importance of meditation.