Wikipedia

Quadruple jump

A quadruple jump or quad is a figure skating jump with at least four (but fewer than five) revolutions.[1] All quadruple jumps have four revolutions, except for the quadruple Axel, which has four and a half revolutions. The quadruple toe loop and quadruple Salchow are the two most commonly performed quads. Quadruple jumps have become increasingly common among World and Olympic level men's single skaters, to the point that not performing a quad in a program has come to be seen as a severe handicap.[2][3] This phenomenon is often referred to as the "quad revolution".[4] Since 2018, quadruple jumps have also become an increasingly common feature of women's skating, although they are not allowed under the International Skating Union ("ISU") rules in the ladies' short program.[4][5] The first person to land a ratified quadruple jump in competition was Canadian Kurt Browning in 1988. Japanese skater Miki Ando became the first female to do so, in 2002.

American skater Nathan Chen performing a quad jump during his free skate at the 2018 Internationaux de France.

History of firsts

edit

Men

edit

The following table lists the first recorded quadruple jumps by male skaters in men's singles competition. Only successfully ratified jumps landed in an ISU sanctioned event, or officially recognized by the ISU count toward these records.

Abbr. Jump Skater Nation Event Ref.
4T Quadruple toe loop Kurt Browning   Canada 1988 World Championships [6][7][8]
4S Quadruple Salchow Timothy Goebel   United States 1998 Junior Grand Prix Final [9]
4Lo Quadruple loop Yuzuru Hanyu   Japan 2016 Autumn Classic International [10]
4F Quadruple flip Shoma Uno   Japan 2016 Team Challenge Cup [11]
4Lz Quadruple Lutz Brandon Mroz   United States 2011 Colorado Springs Invitational [12]
4A Quadruple Axel Ilia Malinin   United States 2022 CS U.S. International Classic [13]

Soviet skater Alexandre Fadeev was the first skater to attempt a quadruple jump (a quadruple toe loop) in competition, at the 1984 Winter Olympics in Sarajevo, but it was not officially recognized by the ISU because of a flawed landing.[14]

 
Canadian skater Kurt Browning (right), the first skater to land a quadruple jump in competition, pictured in 1989.

On March 25, 1988, at the 1988 World Championships in Budapest, Hungary, Canadian skater Kurt Browning landed the first ratified quadruple jump (a quadruple toe loop) in competition (with three turns on the landing).[6][7][8] Browning said: "I remember that there were a few people landing the jump (in practice) long before I did, and by watching them I was inspired to try it myself. After landing it, I certainly expected more skaters to start doing it in competition. I was surprised in the next few years when that really did not happen."[6]

At the 1994 Winter Olympics in Lillehammer, Norway, Chinese skater Zhang Min landed the first clean quadruple (a quadruple toe loop) in Olympic competition.[citation needed]

On March 7, 1998, at the 1997–98 Junior Grand Prix Final in Lausanne, Switzerland, American skater Timothy Goebel landed the first ratified quadruple Salchow in combination with a double toe loop.[9][15]

On September 16, 2011, in the short program at the Colorado Springs Invitational, American skater Brandon Mroz landed the first ratified quadruple Lutz in a sanctioned competition.[16][17][18][19][12] On November 12, he landed a ratified quadruple Lutz at the NHK Trophy, becoming the first skater to successfully land a quadruple Lutz in international competition.[20]

On April 22, 2016, in the short program at the Team Challenge Cup in Spokane, United States, Japanese skater Shoma Uno landed the first ratified quadruple flip in competition.[11]

On September 30, 2016, in the short program at the Autumn Classic International in Montreal, Canada, Japanese skater Yuzuru Hanyu landed the first ratified quadruple loop in competition.[10]

The first quadruple Axel attempt was by Russian skater Artur Dmitriev Jr. at the 2018 Rostelecom Cup. He landed forward and fell, receiving both a downgrade and fall deduction.[21] Yuzuru Hanyu also attempted a quadruple Axel during the 2021–22 Japan Figure Skating Championships, although it was downgraded to a triple Axel with a two-footed landing.[22] At the 2022 Winter Olympics, Hanyu’s quadruple Axel attempt received deductions for an under-rotation and a fall [23] but was the first attempt in competition that was not downgraded to a triple Axel.[24] On September 14, 2022, in the free skate at the 2022 CS U.S. International Figure Skating Classic, American skater Ilia Malinin landed the first successful quadruple Axel in competition.[13] As of May 2024, he is the only skater to successfully land the jump in competition.

Malinin is also the first skater to have successfully landed all six types of quadruple jumps in international competition,[25] as well as the first skater to land six quadruple jumps with positive grades of execution in a single free skate at an international competition. This feat was accomplished at the 2024 World Figure Skating Championships in Montreal[26]

No quadruple-quadruple combination (quadruple jumps followed by quadruple loop or toe loop) or sequences (quadruple jumps followed by any quadruple jumps except for quadruple loop or toe loop) have yet been ratified. However, other quadruple combinations have been performed. Canada's Elvis Stojko landed the first quadruple jump in combination (a quadruple toe loop-double toe loop) at the 1991 World Championships.[27] Stojko also landed the first quadruple-triple combination (a quadruple toe loop-triple toe loop) at the 1997–98 Champions Series Final in December 1997.[28] Russian skater Evgeni Plushenko performed the world's first quadruple-triple-double combination (a quadruple toe loop-triple toe loop-double loop) at the 1999 NHK Trophy.[15] Plushenko also landed the first quadruple-triple-triple combination (a quadruple toe loop-triple toe loop-triple loop) in competition at the 2002 Cup of Russia.[15] Yuzuru Hanyu landed the first quadruple-triple sequence (a quadruple toe loop-triple Axel) at the 2018 Grand Prix of Helsinki.[29]

Women

edit

The following table lists the first recorded quadruple jumps by female skaters in women's singles competition. Only successfully ratified jumps landed in an ISU sanctioned event or officially recognized by the ISU count towards these records.

Abbr. Jump Skater Nation Event Ref.
4T Quadruple toe loop Alexandra Trusova   Russia 2018 World Junior Championships [30]
4S Quadruple Salchow Miki Ando   Japan 2002 Junior Grand Prix Final [31]
4Lo Quadruple loop None ratified
4F Quadruple flip Alexandra Trusova   Russia 2019 Grand Prix of Figure Skating Final [32]
4Lz Quadruple Lutz 2018 JGP Armenia [33]
4A Quadruple Axel None performed

French skater Surya Bonaly was the first female skater to attempt a quadruple jump in competition. She attempted a quad toe loop and a quad Salchow at the 1990 European Championships, however the jumps were not ratified. She attempted quad jumps at four more competitions (including the 1992 Winter Olympics[34]), the final being the 1996 World Championships, but all were unsuccessful.

 
Japanese skater Miki Ando, first female skater to land a quad in competition, pictured at the 2009 World Championships.

On December 14, 2002, Japanese skater Miki Ando became the first female skater to land a ratified quadruple jump (a Salchow) in her free skate at the 2002 Junior Grand Prix Final in The Hague, Netherlands.[31]

On March 10, 2018, in the free skate at the World Junior Figure Skating Championships in Sofia, Bulgaria, Russian skater Alexandra Trusova became the first female skater to land a ratified quadruple toe loop in competition.[30] She also became the first female skater to successfully land two quads in one free skate.

Russian skater Alexandra Trusova was the first female skater to land a quadruple jump in combination (a quad toe loop-triple toe loop), at the ISU Junior Grand Prix in Lithuania in September 2018.[citation needed]

The first ratified quadruple Lutz was landed by Russian skater Anna Shcherbakova in a domestic event in October 2018.[15] On October 12, 2018, in the free skate at the Junior Grand Prix in Yerevan, Armenia, Alexandra Trusova landed the first ratified quadruple Lutz in international competition, becoming the first woman to land the jump.[15]

On December 7, 2019, in the free skate at the Grand Prix Final in Torino, Italy, Alexandra Trusova landed the first ratified quadruple flip in competition.[32]

In November 2021, Russian skater Adeliia Petrosian became the first female skater to attempt a quad loop in domestic competition, at the 5th stage of Russian Cup qualifier, in combination with a double toe loop.[35] She landed the quad loop with a "q" call (underrotated) and tried a second quad loop but fell. At the domestic 2022 Russian National Championships on the senior level in December 2021, Petrosian landed two clean quad loops (one in combination).[36]

The first female skater to land a quadruple jump in Olympic competition was during the 2022 Winter Olympics, this achievement, originally, went to Kamila Valieva of the Russian Olympic Committee in the team event women’s free skate. However, she was later disqualified following a doping violation from earlier in the season, thus her achievement nullified. The achievement then was given to Alexandra Trusova of the Russian Olympic Committee where she jumped 5 quadruple jumps during the women’s free skate. Anna Shcherbakova, also of Russian Olympic Committee landed quadruple jumps in the women's singles free skate as well.[34][37] At 2022 Winter Olympics, Anna Shcherbakova became the first woman (and the only woman as of December 2023) to land a quad flip in combination with a triple jump (triple toeloop), also the first woman to land two quad flip jumps in one program.[38]

As of 2023, no female skater has attempted a quadruple Axel in competition.

Pairs

edit
Pairs
Abbr. Jump Skaters Nation Event Ref.
4TW Quad twist lift Marina Cherkasova and Sergei Shakrai   Russia 1977 European Championships [39]
4TTh Throw quad toe loop None ratified [40]
4STh Throw quad Salchow Tiffany Vise and Derek Trent   United States 2007 Trophée Eric Bompard [41]
4LoTh Throw quad loop None ratified [40]
4FTh Throw quad flip None performed
4LzTh Throw quad Lutz None ratified [40]

In pair skating competition, Russian skaters Marina Cherkasova and Sergei Shakrai performed the first ever quadruple twist lift in competition during their free skate at the 1977 European Championships.[39]

At the 2002 Winter Olympics in Salt Lake City, Utah, United States, Chinese pairs skaters Shen Xue and Zhao Hongbo became the first skaters to attempt a throw quadruple jump (a throw quad Salchow). She landed, then fell, and the jump was not ratified.[citation needed] On November 17, 2007, in the free skate at the Trophée Eric Bompard competition in Paris, France, American pairs skaters Tiffany Vise and Derek Trent landed the first ratified throw quadruple jump (a quad Salchow).[41] At the 2018 Winter Olympics in Pyeongchang, South Korea, Canadian pairs skaters Meagan Duhamel and Eric Radford completed the first throw quadruple Salchow in Olympic competition.[42][43][44]

In 2004, Chinese pairs skaters Ding Yang and Ren Zhongfei attempted a throw quadruple toe loop at the Four Continents Championships; the landing was two-footed.

In 2015, Russian pairs skaters Yuko Kavaguti and Alexander Smirnov, at a domestic competition (1st stage of 2015 SPB Cup) became the first skaters to attempt a throw quadruple loop. The landing was two-footed, then she fell.[45] Later in 2015, Kavaguti and Smirnov performed a throw quadruple loop at the 2015 Cup of China, although the landing was two-footed.[46]

Also in 2015, Canadian pairs skaters Meagan Duhamel and Eric Radford, at a domestic competition (2015 Souvenir Georges-Ethier), attempted the first throw quadruple Lutz, but she fell.[citation needed]

Scoring

edit

The quad jump is currently the highest scoring single element in the skater's program short of performing combinations. The higher scoring for more difficult elements was put in place by the introduction of the ISU Judging System in 2004. Before then, the technical scores for each skater were capped at 6.0.[47] The current ISU scoring for quad jumps in base values is listed below.

Base values for quad jumps[48]
Abbr. Jump Base value
4T Quad toe loop 9.5
4S Quad Salchow 9.7
4Lo Quad loop 10.5
4F Quad flip 11
4Lz Quad Lutz 11.5
4A Quad Axel 12.5

Execution

edit

All quadruple jumps have four revolutions, except for the quadruple Axel, which has four and a half revolutions.[49]

A jump harness is often employed in training quads.[50] Quads require an average rotational frequency of around 340 rpm, with the peak rotational frequency usually exceeding 400 rpm.[51] The optimum height is estimated to be around 51 cm (20 in);[52] however, most skaters rarely go above 46 cm (18 in). This is partly because of the heaviness of the skates and partly because skaters have to maintain the balance between the energy put into the jump versus the energy put into the rotation.[51] The height of a quad can be between five percent and eight percent higher than a triple jump. If skaters cannot achieve the necessary height, they must spin faster to compensate.[53] Efficient body contraction is also important due to conservation of angular momentum.[52] According to Deborah King, a professor of exercise and sports sciences at Ithaca College, quads have a slightly higher angular momentum than lower difficulty jumps, but the major difference is in how skaters control the moment of inertia.[54]

Skaters usually begin rotating the jump as soon as they leave the ice,[4] but generally have less than two-thirds of a second to complete their rotation.[51] However, some skaters begin rotating their jumps before they leave the ice, which is known as pre-rotation. This technique is reliant on the skater being physically small and puts added strain on the back, thereby increasing the risk of injury. It is particularly favoured by Russian women skaters but usually fails post-puberty.[55][56] Despite being considered an example of flawed technique, it is not currently penalised by the technical panel.[57]

Greater understanding of successful jump technique has developed over time. Kurt Browning, the first skater to land a ratified quad in competition, has said that when training the jump, "we really just jumped as high as we could and pulled in as hard as we could and hoped for the best."[58] The smallest error may make the difference in the success of a quad attempt. Max Aaron has stated that "The minute your left arm is behind you, or your three-turn is too fast, if your hips don't turn in time, if your foot isn't in the right place, anything will throw you off."[50] Research indicates that changes in arm position of even three or four degrees can significantly affect the rotational speed.[54] According to Ross Miner, the quality of the ice can also affect the success of the jump, especially for the quad Salchow.[50]

Controversy

edit

Performing quads, whether in practice or competition, increases the risk of injury as well as the level of wear and tear on a skater's body.[50] According to Aaron, "the force of a quadruple is huge", and practicing them means "you're going to fall a lot and take a beating".[50] There is a lack of research into the impact of quads on the joints, but the repetitive nature of jump training and the fact that skaters always land on the same foot means that skaters are at risk of developing microfractures that can become more serious with time. Because of this, some coaches try to limit the number of jump repetitions skaters do in practice.[52]

Concerns have been raised about the long-term impact of quads on the bodies of young skaters, especially girls. As of 2023, Elizabet Tursynbaeva of Kazakhstan and Rion Sumiyoshi of Japan are the only female skaters over the age of 18 to ever land a quad in competition.[55] The figure skating community remains divided about the sustainability of such jumps for women past puberty. Rafael Arutyunyan, coach of skaters such as Nathan Chen and Ashley Wagner, has questioned, "Will they still land these jumps at age 18 or 19? They are doing these jumps with bodies that have not developed yet, with bones that are still growing. What will they be at age 40? Will they all need new hips?"[4] His concern has been echoed by fellow coach Linda Leaver, who predicts that "it will be extremely rare for a female skater to be able to do multiple quadruple jumps past puberty". She added, "I also think careers for men will be shorter because of the stress on backs, knees, and ankles, and the body type will be more of a determinate in who can dominate the sport."[5]

The observation that pre-pubescent girls, especially, have an advantage when it comes to quads was one of the stated reasons for the original introduction in 2018 of the proposal to increase the senior category age limit in figure skating to 17. "Younger skaters are able to show more difficult elements until they are fully matured. Therefore we are currently losing Seniors [sic] skaters who are afraid they cannot compete with these younger skaters in Senior Events."[59] This reason was also given by some who responded to the survey conducted by the ISU asking whether the minimum age should be increased,[60] and was listed as a reason for the increase in the ISU FAQ on the subject.[61]

See also

edit

References

edit
  1. ^ "GLOSSARY". International Olympic Committee. Archived from the original on June 9, 2006.
  2. ^ Borzilleri, Meri-Jo (March 25, 2003). "Not taking same path as others". The Gazette (Colorado Springs).
  3. ^ Brennan, Christine (February 16, 2018). "Adam Rippon solid again, but can't keep up technically in men's figure skating competition". USA Today. Archived from the original on March 12, 2018. Retrieved March 11, 2018.
  4. ^ a b c d Hersh, Philip (September 19, 2019). "Quad revolution comes in force to women's figure skating". NBC Sports. Archived from the original on January 7, 2021. Retrieved January 4, 2021.
  5. ^ a b Radnofsky, Louise (October 27, 2019). "The Year Teenage Girls Blew Up Figure Skating". The Wall Street Journal. Archived from the original on January 8, 2021. Retrieved January 4, 2021.
  6. ^ a b c Wilner, Barry (December 2, 1999). "The quad: Skating's evolution is for more revolution". CBS Sports. Archived from the original on October 31, 2000.
  7. ^ a b "A Quadruple Jump on Ice". The New York Times. Associated Press. March 26, 1988. Archived from the original on January 30, 2013. Retrieved February 18, 2022.
  8. ^ a b "Kurt Browning FAQ". www.skate.org. Archived from the original on April 20, 2021. Retrieved February 18, 2022.
  9. ^ a b Atlanta Journal-Constitution, January 4, 1998.
  10. ^ a b "Hanyu first to nail quadruple loop". The Japan Times Online. October 1, 2016. ISSN 0447-5763. Archived from the original on August 12, 2020. Retrieved October 2, 2016.
  11. ^ a b Hoang, Mai (April 23, 2016). "Uno lands historic quad flip at Team Challenge". Golden Skate. Archived from the original on December 4, 2020. Retrieved October 2, 2016.
  12. ^ a b "Brandon Mroz's quad Lutz validated". ESPN. Associated Press. October 26, 2011. Archived from the original on February 18, 2022. Retrieved February 18, 2022.
  13. ^ a b "U.S. figure skater Ilia Malinin lands first quad axel in competition". The Washington Post. September 14, 2022. Archived from the original on September 15, 2022. Retrieved September 15, 2022.
  14. ^ Smith. "Figure Skating: A Celebration".
  15. ^ a b c d e International Skating Union 2021, p. 16.
  16. ^ Brandon Mroz - Quad Lutz (2011 Colorado Springs invitational) Archived December 5, 2016, at the Wayback Machine at Official U.S. Figure Skating Youtube
  17. ^ Hersh, Philip (September 21, 2011). "Top skating official says Mroz could jump into record books". The Chicago Tribune. Archived from the original on October 7, 2011. Retrieved September 21, 2011.
  18. ^ "The first reportedly recognized quadruple Lutz jump". International Skating Union. October 26, 2011. Archived from the original on October 29, 2011.
  19. ^ Rosewater, Amy (October 26, 2011). "ISU confirms Mroz's historic accomplishment". Icenetwork. Archived from the original on February 18, 2015. Retrieved October 26, 2011.
  20. ^ "Brandon Mroz lands historic quad Lutz". Espn.go.com. Associated Press. January 1, 2008. Archived from the original on November 14, 2011. Retrieved November 12, 2011.
  21. ^ "2018 Rostelecom Cup Judge's Scores - Mens" (PDF). ISU Results. November 17, 2018. Archived (PDF) from the original on November 17, 2018. Retrieved November 18, 2018.
  22. ^ "Yuzuru Hanyu attempts quadruple Axel, wins Japan figure skating nationals". NBC Sports. December 26, 2021. Retrieved December 27, 2021.
  23. ^ Kano, Shintaro (February 9, 2022). "Hanyu Yuzuru's quadruple Axel challenge comes up short - but walks away a winner". Olympics.com.
  24. ^ "羽生の挑戦 ４回転半としてＩＳＵ公認大会で初認定 回転不足、転倒で大幅減点も". Daily (in Japanese). February 10, 2022. Retrieved February 10, 2022.
  25. ^ "Malinin becomes first skater to land all six quads". Reuters. December 9, 2023.
  26. ^ "Ilia Malinin wins first world figure skating title with historic six quadruple jumps". Olympic Talk. March 23, 2024.
  27. ^ Dodd, Mike (February 15, 2002). "Men leaps and bounds ahead in skating". USA Today. Archived from the original on November 3, 2012.
  28. ^ Kwong, PJ (October 29, 2010). "The Quad and The Canadians". CBC Sports. Archived from the original on February 11, 2012. Retrieved October 31, 2011.
  29. ^ "Yuzuru Hanyu (JPN) hits quad toe-triple Axel en route to gold in Helsinki – ISU". www.isu.org. Lausanne: International Skating Union. November 4, 2018. Archived from the original on April 26, 2021.
  30. ^ a b Zaccardi, Nick (March 10, 2018). "13-year-old is first female figure skater to land two quads (video)". OlympicTalk. Archived from the original on February 17, 2022. Retrieved February 18, 2022.
  31. ^ a b "Miki Ando". Absolute Skating. 2004. Archived from the original on February 16, 2008.
  32. ^ a b Goh, ZK (May 26, 2020). "Alexandra Trusova recognised by Guinness Book of World Records again". Olympics.com. Archived from the original on February 18, 2022. Retrieved February 18, 2022.
  33. ^ "Alexandra Trusova (RUS) lands quad Lutz". 2018. Retrieved March 28, 2022.
  34. ^ a b Park, Alice (February 16, 2022). "Quadruple Jumps Are Transforming Women's Figure Skating. Surya Bonaly Tried to Do It 30 Years Ago". Time. Archived from the original on February 16, 2022. Retrieved February 18, 2022.
  35. ^ "Фигуристка Аделия Петросян впервые в истории исполнила четверной риттбергер" [Figure skater Adelia Petrosyan performed the quadruple loop for the first time in history]. TASS (in Russian). November 19, 2021. Archived from the original on December 17, 2021. Retrieved February 19, 2022.
  36. ^ "Аделия Петросян чисто откатала произвольную программу с двумя четверными риттбергерами" [Adelia Petrosyan skated a clean free program with two quadruple loops]. Sports ru (in Russian). December 25, 2021. Retrieved December 31, 2021.
  37. ^ Jeré Longman; Weiyi Cai; Marco Hernandez; Taylor Johnston; Denise Lu; Yuliya Parshina-Kottas; Emily Rhyne; Joe Ward; Jeremy White (February 17, 2022). "How Russia's Anna Shcherbakova Won as Kamila Valieva Fell to Fourth". The New York Times. Archived from the original on February 17, 2022. Retrieved February 18, 2022.
  38. ^ "Shcherbakova wins as ROC duo finish 1-2 in women's singles figure skating at Beijing 2022-Xinhua". english.news.cn. Retrieved January 12, 2023.
  39. ^ a b Hines, James R. (2011). Historical Dictionary of Figure Skating. Scarecrow Press. p. 57. ISBN 978-0810868595.
  40. ^ a b c International Skating Union 2021, p. 17.
  41. ^ a b "Quadruple Throw Salchow – Tiffany Vise and Derek Trent Land the First Quad Throw Salchow". Figureskating.about.com. November 17, 2007. Archived from the original on September 30, 2011. Retrieved November 12, 2011.
  42. ^ "Duhamel and Radford's historic throw quad salchow". NBC Sports. February 15, 2018. Archived from the original on May 24, 2018. Retrieved May 17, 2018.
  43. ^ Dicker, Ron (February 15, 2018). "Popular Skating Duo Pulls Off Historic Move At Winter Olympics". Archived from the original on March 11, 2018. Retrieved March 11, 2018 – via Huff Post.
  44. ^ "Official Results Book – Figure skating" (PDF). International Skating Union. February 23, 2018. Archived (PDF) from the original on December 22, 2018. Retrieved May 17, 2018.
  45. ^ "Wall". vk.com. Archived from the original on February 22, 2022. Retrieved August 26, 2015.
  46. ^ "ISU GP Audi Cup of China 2015" (PDF). isuresults.com. Archived (PDF) from the original on January 3, 2016. Retrieved November 8, 2015.
  47. ^ Meyers, Dvora (February 3, 2022). "How Quad Jumps Have Changed Women's Figure Skating". FiveThirtyEight. Retrieved November 3, 2023.
  48. ^ "ISU Communication 2475 Single and Pair Skating 2022-24". Retrieved October 12, 2023.
  49. ^ Lewis, Tanya (February 14, 2022). "How Olympic Figure Skaters Break Records with Physics". Scientific American. Archived from the original on February 23, 2022. Retrieved February 23, 2022.
  50. ^ a b c d e Brannen, Sarah S. (March 20, 2012). "The fourth dimension: U.S. men analyze the quad". Ice Network. Archived from the original on March 4, 2016.
  51. ^ a b c Gonzalez, Robbie (February 9, 2018). "Figure Skating's Quintuple Jump: Maybe Impossible, Definitely Bonkers". Wired. Archived from the original on December 31, 2020. Retrieved January 5, 2021.
  52. ^ a b c Tabb, Michael (March 30, 2017). "The physics behind figure skating's most difficult jump". Quartz. Archived from the original on April 1, 2017. Retrieved May 2, 2017.
  53. ^ Macur, Juliet; Cai, Weiyi; Parshina-Kottas, Yuliya; Ward, Joe (February 16, 2022). "How the Quad Jump Is Changing Women's Figure Skating". The New York Times. Archived from the original on February 21, 2022. Retrieved February 22, 2022.
  54. ^ a b Lamb, Evelyn (February 7, 2018). "How Physics Keeps Figure Skaters Gracefully Aloft". Smithsonian Magazine. Archived from the original on January 31, 2021. Retrieved January 23, 2021.
  55. ^ a b Meyers, Dvora (February 3, 2022). "How Quad Jumps Have Changed Women's Figure Skating". FiveThirtyEight. Archived from the original on February 18, 2022. Retrieved February 22, 2022.
  56. ^ Oxley, Sonia. "Winter Olympics: Who is Kamila Valieva's coach Eteri Tutberidze?". BBC Sport. Retrieved February 22, 2022.
  57. ^ Choi, Candice (February 17, 2022). "Explainer: How figure skaters deliver quadruple jumps". AP News. Archived from the original on February 19, 2022. Retrieved February 22, 2022.
  58. ^ Chow, Denise (February 23, 2018). "Will figure skating ever see a quintuple jump? Here's what physics says". NBC News Mach. Archived from the original on January 31, 2021. Retrieved January 23, 2021.
  59. ^ "ISU Communication 2160". Retrieved November 3, 2023.
  60. ^ "ISU Survey On Figure Skating Age Limits". Retrieved November 4, 2023.
  61. ^ "ISU FAQ Age limit". Retrieved November 4, 2023.

Further reading

edit
Retrieved from "https://en.wikipedia.org/w/index.php?title=Quadruple_jump&oldid=1235336169"