Editing Discus throw (section)

==Regulations==
The event consists of throwing a heavy disc, with the weight or size depending on the competitor. Men and women throw different sized discs, with varying sizes and weights depending on age. The weight of the discus is either governed by [[World Athletics]] for international or [[USA Track & Field]] for the United States.

In the United States, [[Henry Canine]] advocated for a lighter-weight discus in high school competition. His suggestion was adopted by the [[National Federation of State High School Associations|National High School Athletic Association]] in 1938.<ref name="Aledo">{{cite web|url=https://www.newspapers.com/image/?clipping_id=90169040&fcfToken=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmcmVlLXZpZXctaWQiOjMwMjU0NzMwOCwiaWF0IjoxNjM4ODQ1NTMxLCJleHAiOjE2Mzg5MzE5MzF9.98n1pNWF4wMNFC7BlANhG9M5MEMdBgSES0Kjq2-ixAY|title=Henry E. Canine resigns as mentor at high school in Aledo|publisher=The Daily Times (Davenport, Iowa)|date=August 30, 1938|access-date=December 6, 2021}}</ref>

{| class="wikitable" style="display: inline-table;"
|+US Weights<ref>{{Cite web|url=https://www.everythingtrackandfield.com/throwing-implement-weight-requirements|title=Track and Field Throwing Implement Weight Requirements Rules|website=www.everythingtrackandfield.com|access-date=2020-03-11}}</ref>
|-
!Age
!Men
!Women
|-
|High School
|1.6&nbsp;kg
|1&nbsp;kg
|-
|-
|Collegiate
|2&nbsp;kg
|1&nbsp;kg
|-
|-
|Professional
|2&nbsp;kg
|1&nbsp;kg
|-
|-
|Master's (35–59)
|1.5&nbsp;kg
|1&nbsp;kg
|-
|-
|Master's (60–74)
|1&nbsp;kg
|1&nbsp;kg
|-
|-
|Master's (75+)
|1&nbsp;kg
|0.75&nbsp;kg
|-
|}
{| class="wikitable" style="display: inline-table"
|+ International Weights<ref>{{Cite web|url=https://www.worldathletics.org/about-iaaf/documents/book-of-rules|title=Book of Rules {{!}} Official Documents|website=www.worldathletics.org|access-date=2020-03-11}}</ref>
|-
!Age
!Men
!Women
|-
|-
|≤17
|1.5&nbsp;kg
|1&nbsp;kg
|-
|-
|18–19
|1.75&nbsp;kg
|1&nbsp;kg
|-
|-
|20–49
|2&nbsp;kg
|1&nbsp;kg
|-
|-
|50–59
|1.5&nbsp;kg
|1&nbsp;kg
|-
|-
|60–74
|1&nbsp;kg
|1&nbsp;kg
|-
|-
|75+
|1&nbsp;kg
|0.75&nbsp;kg
|-
|}

[[File:Sport discus for men (2 kg) IAAF certified.jpg|thumb|left|Discus (2&nbsp;kg), [[World Athletics]] certified for competitions

]]
[[File:Sport discus for men (2 kg) IAAF certified, side view.jpg|thumb|left|Side view]]
[[File:Discus longitudinal section.svg|thumb|left|Longitudinal section (schematic)]]
The typical discus has sides made of plastic, wood, fiberglass, carbon fiber or metal with a metal rim and a metal core to attain the weight. The rim must be smooth, with no roughness or finger holds. A discus with more weight in the rim produces greater angular momentum for any given spin rate, and thus more stability, although it is more difficult to throw. However, a higher rim weight, if thrown correctly, can lead to a longer throw. In some competitions, a solid rubber discus is used (see [[#United States|in the United States]]).

To make a throw, the competitor starts in a circle of {{T&Fcalc|2.5|m}} diameter, which is recessed in a concrete pad by {{convert|20|mm|in}}. The thrower typically takes an initial stance facing away from the direction of the throw. They then spin anticlockwise (for right-handers) {{frac|1|1|2}} times while staying within the circle to build momentum before releasing the discus. The discus must land within a 34.92º [[circular sector]] that is centered on the throwing circle.<ref>{{Cite web|url=https://sportsaspire.com/discus-throw-rules|title=The Rules and Regulations Every Discus Thrower Should Be Aware Of|date=2009-11-04|website=Sports Aspire|access-date=2020-03-11}}</ref> The rules of competition for discus are virtually identical to those of [[shot put]], except that the circle is larger, a stop board is not used and there are no form rules concerning how the discus is to be thrown.

The basic motion is a fore-handed sidearm movement. The discus is spun off the index finger or the middle finger of the throwing hand. In flight the disc spins clockwise when viewed from above for a right-handed thrower, and anticlockwise for a left-handed thrower. As well as achieving maximum momentum in the discus on throwing, the discus' distance is also determined by the trajectory the thrower imparts, as well as the aerodynamic behavior of the discus. Generally, throws into a moderate headwind achieve the maximum distance. Also, a faster-spinning discus imparts greater gyroscopic stability. The technique of discus throwing is quite difficult to master and needs much experience to perfect; thus most top throwers are 30 years old or more.

The discus throw is sometimes contested indoors, but it is not included at the [[World Athletics Indoor Championships]]. [[World Athletics]] used to keep "world indoor best" discus records, but since 2023 they now combine both indoor and outdoor marks.<ref>{{Cite web |title=Kanter throws 69.51m world indoor best in Växjö {{!}} NEWS {{!}} World Athletics |url=https://worldathletics.org/news/news/kanter-throws-6951m-world-indoor-best-in-vaxj |access-date=2024-01-13 |website=worldathletics.org}}</ref><ref>{{Cite web |date=2023-05-23 |title=Indoor track to be renamed short track by World Athletics |url=https://www.nbcsports.com/olympics/news/indoor-track-and-field-short-track-world-athletics |access-date=2024-01-13 |website=NBC Sports |language=en-US}}</ref>

[[Image:Discobolus Kleomelos Louvre G111.jpg|thumb|Discus-thrower, tondo of a [[kylix (drinking cup)|kylix]] by the Kleomelos Painter, [[Louvre Museum]]|alt=]]

[[Image:Discus Thrower Copenhagen.jpg|thumb|Modern copy of [[Myron]]'s ''[[Discobolus]]'' in [[University of Copenhagen Botanical Garden]], Denmark|alt=|none]]