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Throwing is a physical action that consists of a and then releasing it into a trajectory, usually with the aim of impacting a distant target. Throwing typically refers to hand-throwing by with , in which the projectile is in a and the proximal limb segments move through compounded to impart a mechanically advantaged swinging motion. For other animals, the definition of throwing is somewhat unclear, as other actions such as or spraying may or may not be included.

are the most proliferative throwers in the animal kingdom, and they typically throw as a form of agonistic behavior. Of all primates, are by far the most capable throwers, and throw a large variety of projectiles with a much greater complexity, efficacy and accuracy. Throughout , humans (especially ) have used hand-thrown projectiles for and in — first through , then refined weapon-throwing (e.g. , or dart), and into modern day with payload-carrying devices such as , and canisters.

To overcome the biophysical limitations of throwing by hand, humans also designed tools to improve the efficiency of their throwing techniques. The , , sling and various models of are notable examples of throwing mechanisms.

With the advent of the bow and arrow, and later the -based , human innovation into throwing tools as weapons essentially halted, but throwing either by hand or with tools has persisted for purposes (such as thrower tools in and clay pigeon shooting) or as a form of . Throwing is thus still performed in many and , particularly . In (especially track and field) throwing is the main determiner of the outcome.


Evolutionary history
Throwing dates back two million years to .Melissa Hogenboom, " Origins of human throwing unlocked", (26 June 2013). Development of the offensive throwing of is mostly a development of the , although the aimed throwing of sticks and rocks by male chimpanzees during agonistic displays has been observed, first described by in 1964.Goodall, J. Tool-using and aimed throwing in a community of free-living chimpanzees. Nature 201, 1264–1266 (1964). "Accumulative throwing", that is, the targeted throwing of rocks at a specific target, leading to the gradual accumulation of a stone pile, has also been described for chimpanzees.H. S. Kühl et al., "Chimpanzee accumulative stone throwing", Scientific Reports 6, 22219 (2016), . Wooden darts were used for hunting at least from the Middle Paleolithic, by Homo heidelbergensis. The is a development of the Upper Paleolithic, certainly in use by the (c. 20,000 years ago).

Human athletes can achieve throwing speeds close to , far in excess of the maximal speed attainable by chimpanzees, at about . This ability reflects the ability of the human and to store elasticity until it is needed to propel an object.


Types
Types of throws include overhand throws, underhand throws and using both hands. Overhand throws are thrown predominantly above the shoulder, underhand throws below. Overhand throws are usually significantly faster, and ball speeds of have been recorded in . Thrown objects can often be intentionally spun for stability or aerodynamic effects.

The notion of throwing typically refers to an action performed without mechanical assistance, but mechanical assistance, as long as it does not involve the release of or energy, does not fundamentally change the nature of the action, and can thus be considered as throwing too. As such, throwing mechanisms will be discussed in this section.


Overhand throwing motion
The overhand throwing motion is a complex that involves the entire body in a series of linked movements starting from the legs, progressing up through the pelvis and trunk, and culminating in a motion in the arm that propels a projectile forward. It is used almost exclusively in athletic events. The throwing motion can be broken down into three basic steps: cocking, accelerating, and releasing.

Desired qualities in the action produce a fast, accurate throw. These qualities are affected by the physical attributes of the thrower like height, strength, and flexibility. However it is mainly the throwing motion mechanics and the thrower's ability to coordinate them that determines the quality of the throw. Determining the desired qualities of the throwing motion is difficult to assess due to the extremely short amount of time that it takes professionals to perform the motion.


Throwing mechanisms
Throwing mechanisms, along with projectiles themselves, rank amongst the oldest technological artefacts in the archaeological records. They vary greatly in size and complexity, from the hand-held and extremely simple sling, to the very heavy and complex . These two types of devices have in common with hand-throwing the fact that the only requirements for their projectiles are size and weight. In that sense they differ from more specialized throwing techniques such as those developed in , where the projectiles have very strong requirements for their shape.


Uses

Thrown weapons
Throwing is used for propelling weapons such as stones or spears at enemies, predators, or prey.

  • , the art of throwing a knife at a target
  • throwing was used and until relatively recent times was the predominant mode of weaponry used in warfare
  • are thrown, usually overhand
  • (throwing sticks) are used by Aboriginals for hunting purposes.
  • are traditional Japanese thrown weapons
  • are thrown explosives


Sports and games

Track and field contains four major throwing events: , , and . The is the fifth most common field throwing event, while the is unique to disability athletics.


Distant exchange and disposal of artifacts
Throwing can be performed in a non-agonistic way, when the target is a cooperating agent who will perform a somewhat opposite action called . Humans are most likely the only animals capable of throwing with such an intent. This is an almost exclusively intraspecific behavior, whose goal is to exchange artifacts without having to shorten the distance between the participants. The seemingly unique exception to this intraspecificity is when humans play a game called fetch with a , although in that situation the dog always catches, never throws.

Such use is so common that it is a common metaphor for figuratively sending something to someone (e.g. ).

An other very common use of the behavior is for disposal. The employed term is then typically throwing away, and it too is very commonly used figuratively.


Sexual differences
Studies differ as to the degree of sexual dimorphism in throwing amongst modern humans.

Research by found that men and women throw almost equally well with their non-dominant hand, suggesting that the sexual differences were probably due to differences in training.

Other research suggests there exist innate biological differences between the sexes that lead to disparities in throwing efficiency, with males better adapted at delivering more effective throws than females.


Non-primates
Throwing is rare among non-primates but, provided the definition is relaxed to entail for instance , several examples can be found amongst various taxa, such as , or the .

have been observed throwing rocks and logs, using their trunk to grab and flick items, although they lack the accuracy that primates can achieve, and it is more commonly used as a warning to aggressors.

If one is willing to consider dropping as a special case of throwing, then one can include birds, most notably , as some species are known to drop stones in order to break shells or other hard food sources on the ground.

are often observed throwing in the air, usually by hitting them with their caudal fin. This behavior is speculated to be purely recreational.


See also
  • Catch (game)


External links
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