What is the reason aerobic exercise is better than anaerobic exercise?

• A. Increases muscle mass only
• B. Allows heart to supply oxygen to muscles
• C. Decreases lung capacity
• D. Eliminates need for rest

Answer: (B)

Aerobic exercise improves the body's ability to deliver and use oxygen during sustained activity. Muscles rely on oxygen to generate energy through aerobic metabolism, so a stronger heart and better lung function make this process more efficient. Training increases stroke volume, capillary density, and mitochondrial function, which raises VO2 max and endurance. The other ideas miss this central benefit: increasing muscle mass is more a hallmark of anaerobic training; lung capacity generally improves rather than decreases; and rest is still needed after workouts.