The 12 Lifecycle Phases (十二长生) is a framework in Chinese metaphysics for understanding the vitality of Qi (气). Qi represents various energy states that can be robust, feeble, or balanced. The “12” in the 12 Lifecycle Phases indicates twelve unique states or phases within this system. Each phase represents a distinct state in Qi’s development, highlighting the various stages of its life cycle. This framework is essential for comprehending the dynamic nature of Qi and its influence on life and destiny.