Is your low back feeling #tight? The quadratus lumborum muscle (QL) is often overlooked when it comes to low back pain. We believe this is one of the best stretches out there for the QL muscle. Hold for up to 2 minutes per side. The QL muscle becomes tight due to the excessive sitting in our daily lives. A tight QL muscle presents with achy/dull low back pain when sitting or standing for long periods of time. People with QL tightness also have trouble straightening from the sitting to standing p