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Explore top-rated models for targeted lower back and glute gains. Discover the best back extension machines of 2023—expert reviews & buyer's guide below.
The leg extension machine was created by American fitness guru Jack LaLanne in the 1950s. [3] 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. [3] The machine was made to target the quadriceps.
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This machine has been used to strengthen not only the erector spinae muscle, but also gluteus maximus and part of hamstring muscles (biceps femoris). When back extension is attempted with this machine, the range of motion at hip is found to be relatively more, while the accompanying stresses at hip and back have been found not to relatively ...
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This compensates for weakness of hip extension. Damage to the inferior gluteal nerve causes loss of extension at hip, and causes the buttock to waste. The normal gluteus maximus gait is when the gluteus maxims begins to contract at moment of heel-strike, slowing forward motion of trunk by arresting flexion of hip and initiating extension.
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