KOAPRO Psoas & Hip Hook Release Tool for Iliacus & Hip Flexor; Alleviate Hip Pain, Premium Targeted Deep Tissue Massager for Back, Core, Iliopsoas, Piriformis etc., Durable for Relief & Recovery

KOAPRO Psoas and Hip Hook Release Tool for Iliacus and Hip Flexor; Alleviate Pain and Tension, Targeted Deep Tissue Massager for Back, Core, Iliopsoas, Piriformis etc., Boost Relief and Recovery

Aletha - Orbit Hip Flexor Release Ball | Psoas Massage Ball for Pain Relief and Trigger Point Muscle Therapy

Tight Hip, Twisted Core: The Key to Unresolved Pain - by Koth, Christine and Pimas, Masha (Paperback, Aug 13, 2019)