A punching bag is a sturdy bag designed to be repetitively punched, for use in physical exercise or stress relief in order to improve one of three areas: physical strength, aerobic fitness, or punching technique.Punching bag have been used in martial arts and swordplay for as long as there has been a written history of military training. Similar apparatus in Asian martial arts include the kinawan makiwara and the Chinese mook jong, which may have padded striking surfaces attached to them.
In martial arts and combat sports such as Karate, Taekwondo, and Muay Thai, Heavy bag, standing bags, and similar apparatuses have been adapted for practicing kicking and other striking maneuvers in addition to developing punching technique.

