The element of surprise is a critical part of all forms of combat. We tend to associate stealth with the modern weapons of war, but in this episode, Fight Science deals with the art of stealth in martial arts, both past and present. The art of stealth in martial arts involves four elements: disguised attacks; hidden defenses; infiltration and evasion. These elements form our framework for a series of tests designed to reveal the secrets of fighting with stealth. The Fight Science team of technical specialists, sports physiologists and biomechanical engineers will test the skills of a group of elite martial artists under extreme conditions to comprehend the stealthy skills they employ in their fighting techniques. Fight Science investigates Capoeira, the dance-like fighting style of Afro-Brazilian slaves. We look at the elusive nature of Qi (Chi) through the amazing feats of a Shaolin master. We examine the clandestine skills of Ninjas, and test the leaping mastery of Free Runners during our investigation into the art of stealth.