Hap Ki Do : The Gentle Art of Self Defense Turn an attacker's strength against him. You will learn how to recognize an attacker's vital points and how to strike those areas with a minimal amount of force. This style of martial arts is suitable for anyone. Those seeking to learn street self defense will find Hapkido an excellent means of self defense. Hapkido classes are taught by the esteemed Master George Panagakos, MD.