Justo Dieguez, creator of the revolutionary Keysi Fighting Method, tackles this first video of a complete instructional series, focusing on different sequences of action-reaction in situations of risk. Our natural barriers: hands, arms, elbows, shoulders, skull and legs, help us protect our weakest areas. Properly used, they create a flexible and articulated protective frame, which works for us spontaneously and naturally. That flexibility, together with the body mechanics and its capacity for constant change, give us the ability not only to create a shield around us, but also to use those same tools for the attack.