Dragon, a somewhat more yang pose, stretches the ilio - psoas muscles of the front hip and thigh and helps prepare you to sit by establishing an easy forward tilt to the pelvis. (yogajournal.com)
Practice each pose regularly to obtain supple psoas muscles which will help to prevent pain, strain or future injury to the hip flexors. (fitbodyhq.com)
There are many other poses than can assist with opening the hips and loosening the infamously tight psoas muscles. (fitbodyhq.com)