In a lunge position with one hip flexed and one extended, what movement occurs at the pelvis for the forward leg?

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In a lunge, the front hip goes into flexion, and the pelvis on that side must adjust to keep the spine aligned and the balance stable. The typical pattern is a posterior tilt of the forward-side pelvis, which helps reduce excessive curvature in the lower back as the hip flexes. At the same time, the pelvis on that side tends to rotate outward (external rotation) to accommodate the thigh’s motion and keep the knee tracking over the foot. Together, these movements—posterior tilt and outward rotation of the forward leg’s pelvis—fit the way the pelvis and hip joints adapt during the descent into a lunge.