A martial arts dummy might be an important piece of gear, depending on what style of martial arts you train in. It is amazing how extensive the selection is today. The variations run the gamut from a plastic molded image of a man from the waist up, to a dummy to practice holds and locks on, to a wooden or plastic trunk with arms sticking out of it.
We in the art of Leung Ting WingTsun®, of course, know about a martial arts dummy because we have one in our advanced training regimen. It is the sturdy cylinder of wood with straight, tapered wooden arms and a leg placed at exact positions. It is a design that goes back perhaps hundreds of years. Some say that the 108 Wooden Men Hall of the Shaolin Monastery inspired its design. The 108 wooden men hall was, according to legend, a hall way with dozens of floor-boards that, when stepped on, would trigger a dummy that would fly out of the wall to attack a candidate for graduation from the training at the monastery. A great outlet for a top-notch selection of wooden dummies for Wing Tsun / Wing Chun training is www.wle.com .
Some of the wooden dummies designed by the commercial world available at martial art supply stores can be installed on a wall. Some have spring-loaded arms and possibly a leg. Others are merely one spring loaded arm. An outlet for a good selection is: https://www.everythingwingchun.com/warrior-martial-arts-wooden-dummies-s/302.htm .
Dummies made for jiu Jitsu grappling practice come in a variety of postures, from sitting upright to stretched out. Even Wal-Mart has a selection of these! Other outlets include http://jiujitsudummy.net/ and www.awma.com, and https://www.centurymartialarts.com/grapple/grappling-dummies .
Martial arts training advice as well as all kinds of sports advice and equipment revues are available at the Sports Fitness Advisor: https://www.sport-fitness-advisor.com/martial-arts-training.html
-Sifu Keith Sonnenberg