Which of the following positions involves lying on the stomach?

The correct choice is the prone position, which specifically refers to lying flat on the stomach, with the face and front of the body facing downward. This position is commonly used in various physical therapy treatments, assessments, and rehabilitation exercises, as it allows for specific muscle engagement, spinal alignment, and enhances certain therapeutic techniques.

In contrast, the supine position involves lying on the back, while the lateral recumbent position describes lying on one side of the body. The normal anatomic position refers to an upright posture where a person stands facing forward, with arms at the sides and palms facing forward. Understanding these definitions helps to clarify which position aligns with the description of lying on the stomach.