The psoas muscles helps bring your knee up to your chest, helps you stay upright and is what connects your upper body to your lower body...kinda important! Taking the time to pull it back into alignment, stretch it and strengthen it, can help your every posture, lessen front of the hip pain and low back pain.
You will need a chair or couch to place your legs on while you are laying on the floor. You can use a towel to help find neutral pelvis.