In martial arts, a waster is a practice weapon, usually a sword, and usually made out of wood, though nylon (plastic) wasters are also available. Nylon being much safer than wood, due to it having an adequate amount of flex for thrusts to be generally safe, unlike wooden wasters. Even a steel feder has more flex than most wooden wasters. The use of wood or nylon instead of metal provides an economic option for initial weapons training and sparring, at some loss of genuine experience. A weighted waster may be used for a sort of strength training, theoretically making the movements of using an actual sword comparatively easier and quicker, though modern sports science shows that an athlete would most optimally train with an implement which is closest to the same weight, balance, and shape of