Psoas Facts for Therapists: 1. It’s your only muscle connecting your spine to your legs. – The psoas major originates from T12–L5 and inserts on the lesser trochanter of the femur. No other muscle does that. It bridges the core and the legs—literally. 2. It might store emotional stress. – Some somatic therapists and movement specialists call it the “muscle of the soul” due to its deep fascial connections and role in the fight-or-flight response. (Vagus nerve and psoas have proximity through the