What action is produced by the quadriceps femora muscles during the concentric phase of the back squat exercise?

Question

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During the concentric phase of the back squat exercise, the quadriceps femora muscles are responsible for knee extension, which is the straightening of the knee joint as the body moves upward. This is the primary action produced by the quadriceps muscles during the back squat exercise.

What Action Is Produced by the Quadriceps Femora Muscles During