Which of the following best defines aerobic capacity?

Aerobic capacity refers to the body's ability to utilize oxygen during sustained physical activity, particularly during aerobic exercises like running, swimming, or cycling. This measurement is often expressed as maximum oxygen uptake (VO2 max), indicating how efficiently your body can deliver and use oxygen while engaging in such activities. A higher aerobic capacity means an individual can perform physical tasks with greater endurance and efficiency.

While other options reference different aspects of fitness, they do not directly relate to aerobic capacity. For instance, the ability to lift heavy weights pertains to strength rather than aerobic endurance. Duration of a cardio workout describes how long an individual exercises but does not address the efficiency of oxygen use during that exercise. A measure of strength focuses solely on muscle power and does not consider the cardiovascular system's role in sustained activity. Thus, the second choice accurately encapsulates the essence of aerobic capacity, aligning with the understanding of cardiovascular endurance and overall fitness.