How is body alignment best defined?

Body alignment is best defined as the way the head, arms, and legs are aligned with one another. This concept is crucial for maintaining good posture and ensuring that the body is positioned in a way that minimizes strain on muscles and joints. Proper body alignment supports efficient movement and can help prevent injuries and discomfort, especially for individuals who may be immobile or require assistance, such as patients in a healthcare setting.

The other options focus on different aspects of physical health. Body mass index (BMI) is a measure related to body weight and height, while orientation in a resting position and maintaining balance while standing relate to different physical states or abilities, but do not directly define body alignment itself. Understanding body alignment is essential for CNAs as it plays a vital role in patient care, particularly in repositioning and transferring patients safely.