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Activated with other muscles when pelvis elevates when standing on one leg and position of body relative to gravity is altered (as when standing on wobble board). Initially assists in rotation to neutral position only when waist is initially significantly rotated.
This would suggest that you need an asymmetrical load to stimulate this muscle more than superficially.Movement
Right Lateral flexion [Right Quadratus Lumborum]
Left Lateral flexion [Left Quadratus Lumborum]
Rotation (from rotation to neutral position)
Stabilizes pelvis and lumbar spine