Jigoro Kano, developed Judo from Koryu Ju Jutsu systems, particularly Tenjin Shinyo-ryu, and Morehei Ueshiba developed Aikido from Daito-ryu Aiki-jujutsu. Both these systems were fundamentally based on attacking the anatomical weak points of the human body. Although both masters reduced the emphasis on anatomical targeting in their respective modern budo systems, although these areas are still studied, primarily by advanced grades in these arts, understanding how human anatomy works to break structure, use leverage and enhance strikes are a fundamental skill that formed the basis of the effectiveness of these arts for self-defence, largely lost in the development of sports based martial arts practices.