Eudynamia (from the Greek eu = good, well, and dynamis = potentiality, possible, capacity for actualization) designates the good relationship to possibility and the harmonization of the possibles. It means the cultivated capacity to engage, compose, and actualize compossible futures across Person, Earth, Work, and Society (PEWS), while remaining open to the Creal, the creative excess that continually renews what can become. Historically attested in 19th-century medical discourse as “well-regulated life-capacity”, eudynamia is here rearticulated philosophically: it names health and ethics not as static balance or rule compliance, but as dynamic, responsible participation in unfolding and intercreative potential.