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Upper Crossed Syndrome (Phase 1-4) Iron Necks Unlock access to all 8The muscles of the human body are interconnected. When one muscle becomes weak, another muscle takes over the work. In the condition known as UCS, mid back muscles (serratus and lower trapezius) become very weak. As a result, the pectoral and neck muscles tighten. This causes pain throughout the upper body, including shoulder pain and neck pain, as well as a reduced range of motion. This programs aims to resolve these muscle imbalances by