The Secret of AIKI Techniques DVD by Hirokazu Hatamura Tatami Fightwear Main principles of knife self defenseKnife Rorion Gracie Main principles of knife self defenseKnife Disarming Techniques using a lever and the 3 planes conceptTurning a knife against an opponentBody integration into the knife's planeKnife threats to arteries and neckThe threat of a knife from behindKnocking a knife out of the opponent's handPsycho energetic impact to the opponent's central nervous systemThe threat of a knife in everyday life Only by mastering techniques that seamlessly integrate offense and defense can one truly wield effective skills Focus on "skin contact" (musubi) as a foundational principle Aiki mode focusing on creating a "Kongo body"