Tepoztlán enjoys a certain mystique for its pre-Hispanic past and its reputed creative and curative energies. Ensconced amid mountains and beneath a vast sky, the infinitely green valley also has a seasonal river flowing through it. The client for this project—an avid athlete—wanted a house embedded within this setting as a space dedicated to improving people’s physical and emotional wellbeing. As its guiding design principle, the spa needed to blend into the site without impinging on the landscape, keeping the architecture out of view and recognizing the context.