A frequent source of lower-back pain comes from two muscles you might not have heard of—and that makes sense since you rarely see them on those medical posters of human anatomy in doctor's offices.

You could have gone to see a physical therapist and they tell you that your Quadratus Lumborum (QL) is tight. Typically, when I say this to my patients it just comes out without much thought, probably ...

You could have gone to see a Physical Therapist and they tell you that your QL is tight. Typically when I say this to my patients it just comes out without much thought, probably in the assumption ...