Leg extension
{{Short description|Resistance weight training exercise}}
Image:LegExtensionMachineExercise.JPG
The leg extension is a resistance weight training exercise that targets the quadriceps muscle (m. quadriceps femoris){{Cite web |title=Leg extension, machine |url=https://gluteus-maximus.org/exercise/leg-extension-machine/ |access-date=2022-03-31 |website=gluteus-maximus: muscle building, weight loss, training, nutrition |language=en-US | archiveurl = https://web.archive.org/web/20220331194252/https://gluteus-maximus.org/exercise/leg-extension-machine/ | archivedate = 2022-03-31 | url-status = dead}} in the legs. The exercise is done using a machine called the Leg Extension Machine. There are various manufacturers of these machines and each one is slightly different. The leg extension is an isolated exercise targeting one specific muscle group, the quadriceps.{{Cite web |last=Marchetti |first=Paulo |date=May 2017 |title=Effects of Squat Amplitude on Pelvic Tilt and Tibial Inclination |url=https://www.researchgate.net/publication/316844272 |access-date=November 14, 2024 |website=ResearchGate.com}}
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History
The leg extension machine was created by American fitness guru Jack LaLanne in the 1950s.{{Cite web |last=Hefferman |first=Conor |date=December 4, 2017 |title=History of the Leg Extension Machine |url=https://physicalculturestudy.com/2017/12/04/history-of-the-leg-extension-machine/ |access-date=November 19, 2024 |website=Physical Culture Study}} The first prototype is recognized to have been made under Gustav Zander, but labeled the machine as a form of “mechanotherapy” along with other machines that extended the knee and ankle. The machine was made to target the quadriceps. The exact method of inventing the leg extension machine is not consistently recorded, but in most cases, it is attributed to LaLanne.
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