3 kinds of kiai
In Japanese, you could say: "Kiai Wo Ireru" which literally translates into "Insert your Kiai". The meaning is that you could motivate yourself, fire yourself up, get psyched! Or, to give it your all. However.. This is common talk. It is not Martial Arts terminology. From this explanation however, you can relate to Kiai as a shout, giving your all in a technique for example. But Kiai is more than just a shout.
In Martial Arts, Kiai comes down to three things.
- Kiai as accumulation of your energy - coming out as a shout (external Kiai)
- Kiai as accumulation of your energy - without sound (internal Kiai)
- Kiai as a unit of your spirit.
Point 1 and 2 are both referring to physical traits such as biomechenics. The third one, although scientifically arguably physical as well, deals with mindset, intention and spirit.
kiai is a unit of your spirit
When engaging in Kamae for example during Kumite, you have to measure the opponents Kiai. Read and feel his intention and spirit. At the same, measure and feel the Maai i.e. distance.
If you are not aware of this concept enough, you might take a Maai that is too close to begin with. Or, you will close the distance too much. Simply by habit. It works, but only because your opponent is not aware enough too.. Make sure to finetune on your opponents Kiai, so that you can read his movement.
This is Kiai.
To measure and feel lively.
To not get surpurised.
To get one step ahead of your opponent.