weightlifting - How does back extension work? - Physical Fitness

Why is "back extension" exercise called "back extension"? Let's consider the following picture taken from here: Well, in this picture I cannot appreciate any back extension. Wh

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weightlifting - How does back extension work? - Physical Fitness Stack Exchange

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weightlifting - How does back extension work? - Physical Fitness Stack Exchange

Weighted back extension on stability ball exercise instructions