What is meant by aerobic capacity?

Aerobic capacity refers to the ability of the body to utilize oxygen during prolonged physical activity or exercise. It is a measure of how effectively the cardiovascular and respiratory systems can supply oxygen to the muscles, as well as how well the muscles are able to use that oxygen to produce energy. This capacity is influenced by several factors, including heart rate, the efficiency of the lungs, and the metabolic processes within muscle cells.

Choosing the understanding that it encompasses both the amount and the speed of oxygen utilization aligns accurately with the definition of aerobic capacity. This makes it crucial for performance in endurance activities, as it provides insight into an individual's fitness level and endurance capability. Thus, option B encapsulates the essence of aerobic capacity in terms of its function and significance in physical activity.