We tend to think of the psoas as a villain, because tight psoas can pull the spine out of alignment. But it can also become a victim. It works best if it has help from the muscles at the front and the back of the torso to help keep the body properly aligned, especially when it comes to maintaining the integrity of the spinal curves. If those surrounding muscles get tight and pull the pelvis put of place, this can put unnecessary stress on the psoas and impede it’s function.