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A punching bag (or, British English, punchbag) is a sturdy bag designed to be repeatedly punched. A punching bag is usually cylindrical, and filled with various materials of corresponding hardness.
Punching bags have been used in martial arts and swordplay for entire 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.
In martial arts and combat sports—such as karate, taekwondo, and Muay Thai—"heavy" bags, standing bags, and similar apparatuses have been adapted for practicing kicking and other striking maneuvers in addition to developing punching technique.
Punching bags are often filled with grains, sand, rags, or other material, and are usually hung from the ceiling or affixed to a stand. Other bags have an internal bladder to allow them to be filled with air or water. The design of a punching bag allows it to take repeated and constant physical abuse without breaking. The bag must also absorb the impact of blows without causing harm to the user.
There are different types of punching bags, with different names based on their size, use and mounting method. Almost all punching bags are covered with either leather or synthetic materials such as vinyl which resist abrasion and mildew. Canvas can also be used as a bag material where there is lower use and humidity.
Speed bags are small, air-filled bags anchored at the top to a rebound platform parallel to the ground. Speed bags help a fighter learn to keep his or her hands up, improve hand-eye coordination, and learn to shift weight between feet when punching. They are also known as speedballs or speed ball bags. They are generally filled with air and fitted around a tight PU-based or leather material. They come in various sizes, ranging from the large 13x10" (33x25 cm) and 12x9", midsize 11x8", 10x7" (25x18 cm) and 9x6", to the small 8x5", 7x4" and 6x4" (15x10 cm). Generally the larger the bag, the slower it is and the more force is required to keep it going. Large bags are used more for building strength and endurance, while smaller bags allow the training athlete to focus on faster hand speed, timing and coordination. Beginners might view this bag more as a "control bag", not a speed bag, for they will not be able to punch both quickly and repetitively until they gain control over their swinging force and speed.
A boxer normally hits the speed bag from the front with his or her fists, but it is also possible to use fists and elbows to hit the bag from all around it, including the front, back and sides. In this method the user may perform many diverse punching combinations that create improvised rhythmic accents.
Although speed bags are normally hung vertically, recently the additional method of hanging a bag horizontally on a wall has regained popularity. This was very popular during the early twentieth century, specifically the 1920s–1940s era. The same punching skills may be used on the horizontal bag that are used when it hangs vertically. Coordination Bag is a new type of a speed bag that moves unpredictably rather than rhythmically. Additionally, due to the tedious mounting and anchoring necessary when installing a traditional speed bag platform, a portable speed bag platform that installs in a doorway has been created. Designed so that downward pressure stabilizes this portable speed bag platform, it can be installed and removed through a tension system that allows for use in any doorway.
Swerve balls / floor-to-ceiling balls / double-end bags are almost the same as speed bags, with the only differences being that the bag' size, shape and material may be different, and that the cable system is attached to both the ceiling and a clip on the floor — when the boxer makes any strike on the ball, it reacts by swinging fast towards them, the object being to swerve, punch, dodge and improve co-ordination. The harder and faster these bags are hit, the more they rebound and react in different motions and angles, thus giving broader practice to the fighter. Double-floor to ceiling balls which allow for training body-head combinations also exist
Maize bags or slip bags are not punched with great force, but are used in boxing training to improve the athlete's head motion and ability to evade an opponent's punch, their name deriving from the fact that traditionally they are filled with maize.
A heavy bag is a larger, cylindrical bag, usually suspended by chains or ropes and used for practicing powerful body punches, and can be used to toughen hands or any other limb used to hit the bag. Heavy bags are for developing power; technique is best learned on the punch mitts or pads. Some variants of heavy bag are a Banana Bag used in Muay Thai and which is longer than a regular heavy bag to train low kicks and knee strikes and a slim line bag that is thinner than a heavy bag.
Freestanding heavy bags are heavy bags mounted on a weighted pedestal rather than being hung from above. The base is typically filled with sand or water to give more stability to the bag and prevent it from moving around. While they serve the same purpose as hanging heavy bags, they can also be toppled over and used for ground-and-pound practice. Other variations on the standard heavy bag include horizontal suspension from both ends to practice uppercut punches, and non-cylindrical shapes. Freestanding reflex bags (freestanding speed bags) also exist.
Uppercut bags began to appear towards the beginning of the 21st century. With so many different variations of bags and training equipment for boxing taking off, the uppercut bag was and is still a common sight in clubs and gyms.
Designed for uppercut practice, jabbing, curl punching and quick bursts of high and low punching practice, it allows the fighter to punch at different lengths, different speeds and different forces compared to the standard average 4-foot straight PU (polyurethane) punching bags. Some types of uppercut bags: Angle Bag a variant of uppercut bag used for training hooks and uppercuts, Uppercut Horizontal Punching Bag, Teardrop Bag, Body Snatcher/Wrecking ball bag and Bowling Pin Bag used for training knees and uppercuts.
A Wall Bag which is a type of bag that is attached to a wall and can be used for training hooks and uppercuts.
Body-shaped training aids such as the modern "body opponent bag" are made primarily of synthetic materials, and punching bags are sometimes mounted on a weighted pedestal rather than hanging from above. These bags try to simulate a live opponent while providing an opportunity to practice vital area strikes which are generally unsafe to perform on a sparring partner. These are not considered punching bags in the strict sense, but modern versions of apparatus such as the wooden man apparatus of Chinese Wing Chun, the medieval quintain, and target dummies used in modern bayonet training. Large inflatable balloons with weighted bases are another kind of punching bag, often painted with a picture and sold as a children's toy.