The quadratus lumborum (QL) is a deep muscle in the lower back that connects the spine to the pelvis. When it becomes tight or tense, it can cause localized pain in the lower back. This tightness may result from prolonged sitting, poor posture, repetitive movements, or overuse.Stretching the quadratus lumborum can help relieve back pain by lengthening and relaxing the muscle, reducing tension and stiffness. 👉Stretching can also improve flexibility, increase blood flow to the area, and alleviate