> If you do stressful work while sitting at a desk, as so many people do nowadays, you are almost certain to have a shortened, chronically tense psoas—a major c

> If you do stressful work while sitting at a desk, as so many people do nowadays, you are almost certain to have a shortened, chronically tense psoas—a major cause of lower back pain. Yoga instructors talk a lot about the psoas. http://www.foundationyoga.com/sore-back-cranky-hips-your-psoas-could-be-why/ http://www.foundationyoga.com/sore-back-cranky-hips-your-pso...