What is the Mu ren zhuang, Muk Yan Jong or the wooden dummy?

Bruce Lee Wooden Dummy

Muk Yan Jong (Cantonese: muk yan jong/Mandarin: mu ren zhuang) is a wooden dummy used in Chinese martial arts training. It is associated with the martial art of Wing Chun and other kung fu styles of Southern China. Traditionally made from wood, the dummies are now also made from modern constructs such as steel and plastic.

In Wing Chun

The Wing Chun wooden dummy is the most popular form of wooden dummy. A popular legend says it came about when 108 separate wooden dummies from the Shaolin Temple were combined into one by the nun Ng Mui to make training more efficient and effective. The Wing Chun wooden dummy uses an arm and leg configuration designed to cultivate fighting skill and chi simultaneously

In Jeet Kune Do

Bruce Lee, a student of Yip Man, had also made and modified a Wing Chun wooden dummy for his martial arts philosophy ofJeet Kune Do which had a modified neck and a metal leg. Many of the principles of Wing Chun are central to Jeet Kune Do.

In Choy Lee Fut Kung fu

Ching Jong 

Ching Jong (balanced dummy) has a different orientation to the arms more suited to Choy Lee Fut style's arm motions. In this version, the single top arm, protruding straight out from the front, moves up and down, anchored traditionally with a rope and heavy weight (the origin of the namesake) and anchored with a spring to the rear in modern times.

Sui Sau Jong 

The sui sau jong (breaking hand dummy) features a swinging arm around the shoulder level, hanging sandbags, as well as a rotor-like arm at the top, located at head height. 

Ma Jong 

Unlike other dummies, the Ma Jong (horse dummy) is a moveable dummy.

The overall shape of the dummy is a horse, with the main body of a heavy log carrying two frames, a tall one at front and the short one in the rear. Each frames is mounted with a horizontal crossbar that is perpendicular to the log, which has spring mechanism that is connected to the wheels. 

Other dummys used in Choy Lee Fut 

includes the qiang bao zhuang (墻包樁) (a wall mounted sand bag), sha bao zhuang (沙包樁) (a sand bag apparatus, with one main heavy sand bag connected to two other sand bags on its side through a pulley system), and other mechanical dummies.