Which of the following is NOT a health benefit of aerobic exercise?

• A. Improves sleep
• B. Increases energy
• C. Helps reduce body fat
• D. Increases muscle size

Answer: (D)

Aerobic exercise mainly strengthens the heart and lungs and improves how efficiently the body uses oxygen, which translates into clearer improvements in sleep, higher daytime energy, and reductions in body fat. These benefits come from sustained, rhythmic activity that elevates heart rate over time and supports cardiovascular and metabolic health. Increasing muscle size, on the other hand, results from resistance training that significantly overloads specific muscles to trigger hypertrophy. So, while aerobic activity boosts endurance and overall health, it does not typically produce large increases in muscle size.