Most people train for performance. Very few train for reality. In weapons-based violence, pressure changes everything. Timing collapses. Rhythm breaks down. Certainty disappears. Skills that looked sharp in training suddenly become inaccessible when chaos, fear, and unpredictability take over. Functional Under Pressure examines the gap between what looks good in practice and what actually survives under stress. Drawing from decades of experience in pressure-based combative training, Tom Sotis challenges many of the assumptions that dominate modern martial arts, self-defense, and tactical training. Rather than focusing on rehearsed performance, this book explores the deeper principles that determine whether skills remain functional when conditions become unstable. Inside, you will explore: • Why many traditional training methods fail under pressure • How stress alters timing, perception, and decision-making • The hidden dangers of over-cooperative training • Why adaptability matters more than memorization • How pressure exposes functional and non-functional behavior • The relationship between recognition, response, and survival • The role of deception, unpredictability, and broken rhythm in violence • Why realism requires more than intensity or aggression • How to develop training that remains functional under chaos This is not a technique book. It is a book about functionality. Whether you are a martial artist, self-defense practitioner, trainer, coach, military professional, law enforcement officer, or simply someone seeking a more honest understanding of violence and performance under pressure, Functional Under Pressure will challenge how you think about training — and what it truly means to be prepared. Because under pressure, performance is meaningless if functionality disappears.