The increase in the normal lumbar curve with increased pelvic tilt and hip flexion?

The increase in the normal lumbar curve with increased pelvic tilt and hip flexion is called lumbar lordosis. Lumbar lordosis is a normal curvature of the spine that helps to maintain balance and support the body's weight. When the pelvis is tilted forward and the hips are flexed, the spine naturally curves more in order to compensate for the change in alignment. This increased curvature helps to keep the body in a stable position and prevents it from falling forward.