Martial arts is often viewed as a purely physical or spiritual discipline, but beneath every punch, kick, block, and throw lies a foundation of physics and mechanics. The way forces act on the body, the efficiency of motion, leverage, torque, and energy transfer are not just abstract engineering concepts-they are the invisible rules that determine effectiveness in combat. As a mechanical engineering graduate and martial artist, I discovered that the principles I studied in the engineering school-Newton's laws, moments of inertia, normal forces ...etc etc are vividly alive on the training mat. When properly understood, these concepts can transform one's martial arts practice, making movements more efficient, powerful, and precise. This book is written to bridge mechanical engineering and martial arts. It is an exploration of how the principles of mechanical engineering-force, energy, motion, balance, leverage, efficiency-are woven into martial arts. My goal is not to reduce martial arts to equations but to enrich it with understanding. By seeing the mechanics behind the movement, martial artists can refine their techniques, conserve energy, and unlock hidden potential.