Yell when striking or throwing. Particularly used with sword cuts. Causes a forced exhalation of air under pressure that increases power. This tends to be ignored in Aikido but some practitioners believe it is very important. The Ki is the same as Ki in Aikido and the Ai is the same as Ai in Aikido. It means to harmonize Ki with the body. Exhaling on strikes or throws is considered important to having Ki power. Feeling or imagining the flow of Ki is considered an important part of this. The yell helps the student learn this.