Suburi

Suburi (素振り?, lit: naked or unadorned swing) is a Japanese word which is used to describe practice swings used in sports such as baseball, tennis, golf, and in martial arts. Outside of Japan, the word is used exclusively for repetitive individual cutting exercises used in Japanese martial arts such as kendo, aikido, iaidō, and kenjutsu. Often a shinai (for kendo), bokken, suburitō, or even tanren bō are used. An iaitō or shinken can also be used, albeit that is rare.