The Psoas and Flexion

The Psoas is the body’s main hip flexor which is why it is the main muscle of walking but it plays a deeper maybe more important role as a flexor. Flexors are muscles that bring one body part closer to another one. Flexion’s relationship to the nervous system is through our fear response. Our sympathetic nervous system, the system of excitation, from which stems our flight or fight response, manifests through flexion; like all animals in the wild when startled or afraid we automatically react. The psoas is involved in each of these reactions.