The origin of Iai, they say, comes from the time of NARA or HEIAN (758) but generally as a technique was developed in the era saber SENGOKU (Century 15) period of internal wars. When the warrior lost his weapon or twice during the match had to resort quickly to your DAITO or SO (secondary or supplementary weapons) to defend against the enemy during these battles as a technique was developed after many studies and trained as a BU-jutsu (martial art). Today it is said that the IAI is founder Shigenobu Hayashizaki Jinsuke.
When I was 6 years old his father was killed, from there he began to study and train with great intensity in the techniques of sword, went to meditate every day of Hayashizaki Shinto temple, with great passion because I wanted to find a way to avenge the death of his father. One day he received the inspiration to create the BATT IAI Jutsu techniques. At the age of 18 years managed to carry out his revenge and then spread the techniques of their school. Anyway Iai is a sword technique. In the field of ancient sword techniques was not clearly separated as far as was Iai and Kenjutsu from where it was all part of the art in the way of Bushi Ken.
The practice and iai training requires concentration and harmony sum, as the main battle takes place within yourself. It is putting into action the body, mind and spirit, conjugangolo with the sword, then everything becomes a single entity. Ki-Ken-Tai (spirit, sword and body) moving.