Core Nexus - Rotating Psoas & Iliacus Release Tool | Hip Flexor Mobility | All-in-One Lower Back & Sciatica Pain Relief | Muscle Recovery | Performance Enhancement | FSA or HSA Eligible | BlackTHE ULTIMATE IN MASSAGE TOOLS. With its one of a kind two uniquely designed tips the Core Nexus is not only your most effective and time saving psoas muscle release tool and iliacus release tool, it is also your all in one trigger point massage tool for complete body care. Your go to muscle massager that emulates techniques therapists use, mimicking the pressure of eight fingers, thumbs, knuckle, and an elbow targeting the hip flexors known for