[Galinastva]

There are different kinds of mental illness. Any illness that has violent behavior (against others or oneself) would not be a good match with iaito and maybe kendo. This would also include taking on a different personality that is known to be violent. Kendo is a very physically aggresive martial art. What I would consider to be violent is someone who attacks and hits their opponent in a manner as to purposely inflict harm. It would include hitting areas that do not have armor; executing improper waza like baseball bat swinging and following though; continued attacking while exercise is called to a halt during a practice; using fist, feet or other body parts to attack the opponent; pulling out iaito during kendo sparring; purposely hitting opponent with bokken during kata; and verbal outbursts that are not kiai like "I'm going to kill you".