Participation in high-intensity sustained activities, such as long-distance running, is more developmentally appropriate for high school students than elementary students for primarily which reason?

• A. Elementary students' aerobic capacity is limited and less capable of increasing before puberty.
• B. Elementary students prefer bodyweight activities
• C. High school students have more available time for practice
• D. Elementary students already have high endurance

Answer: (A)

The main factor here is maturation and how it affects the body's ability to adapt to endurance training. Before puberty, children have a limited capacity to increase aerobic power—their VO2 max and the systems that support sustained effort (heart, lungs, blood vessels, and muscle oxidative capacity) don’t respond as strongly to endurance training. As kids go through puberty, these systems mature: heart size and stroke volume increase, capillary and mitochondrial density improve, and overall aerobic capacity rises more with training. Because of this, high school students are better equipped to handle and benefit from high‑intensity, long‑duration activities like long-distance running.

Other choices miss the key driver. It’s not about a preference for bodyweight activities, time available for practice, or the belief that elementary students already have high endurance. Those factors are not the developmental basis for why high school students are more appropriate for sustained high‑intensity endurance activities.