Which of the following muscles is best stretched in a side-lying position by having a partner take the knee into full flexion and simultaneously take the hip into extension?

Question

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The rectus femoris muscle is unique among the quadriceps group because it crosses both the hip and knee joints. Stretching it effectively requires hip extension and knee flexion, which is best achieved in the described side-lying position with a partner's assistance.

Which of the Following Muscles Is Best Stretched in a Side-Lying