Always was thought that a sound has a magical effect. Sound can affect the nervous system. Therefore, it is used in the martial arts under the name - kiai. This is a special art of warfare, and the main weapon –is the voice.
In Japan, this phenomenon since ancient times has been considered something mysterious, that could only possess – the dedicated. Kiai – has two connected characters. The first "ki" - refers to the will, the energy, and the second "ai" – association, center. The emergence of such art was based on the observation of a person in danger, a natural reaction, which is usually a cry. It can be different: a cry to call for help, fear or warning. Even just a loud cry of a frightened man can change the intentions of the enemy, or completely stop him.
In the effectiveness of cry believed not only Eastern but Western fighters of past and often used the power of the human voice in the battles. According to many legends, battle cries resounded to the skies and awakened gods from a nap. Therefore, in Japan and Tibet techniques of using voices in the battle has been exalted to the level of art. The essence of this phenomenon lies not in the sound, but in particular to the energy transfer to a target process by using voices. Kiai is a fusion of energy and spirit, is individual for each soldier, and based on his mental and physical abilities.