Which fitness component is defined as the ratio of lean mass to fat?

• A. Body composition
• B. Flexibility
• C. Muscular endurance
• D. Cardiovascular endurance

Answer: (A)

This question is about body composition—the proportion of lean mass (muscle, bone, organs) to fat in the body. The ratio of lean mass to fat directly describes how much non-fat tissue there is relative to fat, which is exactly what body composition measures. The other options describe different fitness aspects: flexibility is about the range of motion at joints, muscular endurance is how long a muscle can perform work, and cardiovascular endurance is how efficiently the heart and lungs sustain activity. These relate to performance or movement, not to the proportion of fat versus lean tissue.