Which aspect does not relate to body composition?

Body composition refers to the various components that make up the body, specifically the proportions of fat mass and lean mass (which includes muscles, bones, and other non-fat tissues). It directly evaluates how much of the body is made up of fat versus lean tissue, making factors like fat mass, lean muscle mass, and total body weight relevant to understanding body composition.

Cardiovascular efficiency, on the other hand, pertains to the effectiveness of the heart and lungs in delivering oxygen to the muscles during physical activity and is more related to cardiovascular fitness rather than the makeup of the body itself. While a healthy body composition can influence overall fitness and performance, it does not directly contribute to defining body composition metrics.