That's thanks to the psoas major muscle, sometimes called the "muscle ... The psoas is also connected to the diaphragm, where breathing is modulated. It's also where many of the physical feelings ...

By “tight hips,” I mean, more specifically, tight psoas muscles ... and proximal attachment points. Strengthen the Psoas While it might seem counterintuitive, when a muscle is tight it ...

In extant monotremes, the posterior thoracic and anterior lumbar ribs provide attachment for ... the lumbar portion of the diaphragm for breathing; the psoas minor muscle inserting on the psoas ...

Maybe it’s a strained muscle. But for a growing number ... your back – when it’s actually not. Because the psoas connects to both the diaphragm and the legs, it also affects your breathing ...