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File:Laura Comstock's bag-punching dog (1901).webm A punching bag is a tough bag which is supposed to be punched a lot. It is used in exercise or stress relief to improve one of three areas: physical strength, aerobic fitness or punching technique.
Punching bags have been used in martial arts for as long as there has been a written history of military training. Similar apparatus in Asian martial arts include the Okinawan makiwara and the Chinese mook jong, which may have padded striking surfaces attached to them.
- DePasquale, Peter (1990), The Boxer's Workout, California: Fighting Fit, pp. 176,