Tameshigiri, literally test cutting, is the practice of cutting a soft target with a sword to check whether the cutting angle, edge alignment and body mechanics of a technique actually work under real resistance. It gives feedback that swinging a blade through open air cannot, since a poorly angled cut through a target is immediately obvious.
Targets are typically rolled, soaked rice straw mats or occasionally bamboo, chosen because their density and fibre structure give a useful approximation of resistance without being unpredictable or unsafe. A clean cut leaves a smooth surface, while a twisted grip or incorrect angle produces a ragged or bent result, so the target itself becomes a form of feedback for the practitioner.
Because tameshigiri normally uses a sharpened shinken rather than a blunt practice sword, it is usually reserved for students who have already built consistent, controlled technique through solo forms. Sessions are supervised and take place in a controlled space, well away from spectators or other practitioners. See our weapons training guide for where cutting practice fits into overall sword training.