The psoas can become very tight with long hours of sitting or intense intervals of cardiovascular exercise. Open hip flexors will help you to step through to basic lunges in a power yoga practice. This quick tip will give you some postures to help lengthen the psoas and target the quads. A great clip for those who like to run, hike, bike or walk and are experiencing knee or hip pain as a result. Your hip flexors could be the key to a healthy lower body.