I read your post about the psoas muscle, where it is located and the main function… Looking at your picture of the psoas and also the illiacus and the their function during movements, finally it is clear to me that my problem and pain and inability to move well when I lift my leg etc and tightness is because of this muscle that it is connected to the spine. Thank you, thank you! This brings me hope that I need to work on this particular muscle the psoas, along with the hip muscles and all the muscles I read on your page that involve the lower spine, hips, etc.