Final answer:
The optimal aerobic exercise training intensity to improve VO2 max is moderate intensity.
Step-by-step explanation:
The optimal aerobic exercise training intensity to improve VO2 max is moderate intensity. Moderate intensity exercises are those during which a person could talk but not sing, according to the U.S. Department of Health and Human Services. Examples of moderate intensity exercises include brisk walking, cycling, and swimming. Engaging in regular aerobic exercise for 2.5 hours at moderate intensity each week can help improve VO2 max.