What position is described as "supine"?

The term "supine" describes a position where a person is lying on their back, facing upward. This position is commonly used in various physical exercises and assessments, including Pilates, as it allows for the engagement of core muscles and facilitates movements that require stability and control. In the context of Pilates, being in a supine position can promote proper alignment and support for performing exercises, thereby enhancing overall effectiveness and reducing the risk of injury.

The other options describe different orientations or positions: faced down refers to a prone position, sitting with legs crossed indicates a seated pose, and propped up against a wall involves an upright posture. None of these define the supine position, which is specifically characterized by lying flat on one's back.