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The prime mover for back extension is the Erector Spinae. It consists of three groups ( longissimus, iliocostalis, and spinalis)

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9y ago

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Rectus Abdominis (sixpack)

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14y ago
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erectus spinae

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9y ago
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The rectus abdominis

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14y ago
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Q: What is the prime mover for trunk flexion?
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