The Iliopsoas is a muscle group consisting of the Iliacus and the Psoas Major and Psoas Minor. Located deep in the front of the hip these muscle are responsible for lifting the leg (hip flexion) and with the leg in a fixed position they flex the trunk. When this muscle group is tight and becomes hyper-tonic, it is thought to be the underlying culprit of many peoples’ low back pain. Extended hours leaning forward at desk work and/or driving can contribute to distorted posture or even lower crossed syndrome. An anterior pelvic tilt and a positive Thomas Test point to a body with tight iliopsoas muscle.