Yes, aerobic respiration supports energy production during exercise, but how much depends on the intensity.

Key Points

• Light/moderate exercise: Oxygen supply is enough, so aerobic respiration provides steady energy.
• Intense exercise: Oxygen demand exceeds supply; the body switches partly to anaerobic respiration, leading to lactic acid buildup (muscle fatigue).

This is why light exercise feels comfortable, while intense exercise causes burning muscles and tiredness.