Kyusho, known in the martial arts community as the martial art of pressure points, is usually used by very experienced martial artists with advanced knowledge of some martial art disciplines such as Karate Jitsu and Kung Fu.
There are about 36 fatal points on the body. The Kyusho teaches how, when, and where to strike to immobilize the opponent, paralyzing part of their body or even knocking them unconscious for a while.
For years, teachers who knew these practices were reluctant to share, reserving them for their children or closest students. Few Karate and Kung Fu practitioners know these practices or know how to use them properly without unintentionally, seriously damaging their opponent.
As a result, some great teachers have considered that these types of practices are very dangerous and have refused to pass them on because of the danger posed to a person who is not prepared.
Furthermore, the art of pressure points, or Kyusho, includes teachings of traditional Chinese medicine, although focused in a different way: it´s not simply about anatomy, but something at a much more advanced and deeper level.