What is the term for a position where one lies on their back?

The term used to describe a position where someone lies on their back is "supine." This position is commonly used in various physical activities, rehabilitation exercises, and medical examinations because it allows for relaxation and adequate support for the spine and body.

In contrast, the term "prone" refers to lying face down, which is the exact opposite of supine. The terms "sitting" and "standing" describe upright positions rather than lying down, thus not applicable in this context. Understanding these terms is important for fitness professionals, as they provide clear communication regarding body positioning during exercises and instruction.