Suburi is a Japanese word for practice swings used in sports such as baseball, tennis, golf, and in martial arts. Outside 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 , bokken, suburitō, or even tanren bō are used. An iaitō or shinken can also be used, albeit rarely. Some common types : katate-suburi holding the weapon with only the left hand haya-suburi rapid suburi where you cut on the forward motion and assume jodan on the return motion, feet should glide on the floor. Sometimes called choyaku-men chōyaku-suburi incorporating a coordinated jumping like movement with the strike jōge-suburi strikes with back swings that almost touch ones lower back and forward swings which almost touch the floor naname-suburi alternating diagonal strikes, cutting across the opponent's torso, starting with a cut to the left shōmen-suburi strikes to an opponent's forehead zenshin-kōtai-shōmen-suburi strikes to an opponent's forehead, starting with forward, then backward. sayū-men-suburi alternating strikes to an opponent's forehead, starting with your right-hand side. Suburi is used as a warm up before actual practice begins, usually done in sets of ten, though sometimes sets of 100 are used . Suburi serves to loosen the wrists and elevate heart rate .