Which term describes the ability to deliver oxygen and nutrients to muscles during prolonged activity?

The term that describes the ability to deliver oxygen and nutrients to muscles during prolonged activity is aerobic capacity. This concept revolves around the efficiency of the cardiovascular system in supplying oxygen to the muscles while allowing them to sustain activity over an extended period. Aerobic capacity is crucial for endurance activities, such as running, cycling, and swimming, where the body's need for oxygen increases during sustained exertion.

The other terms, while related to physical fitness, do not specifically address the delivery of oxygen and nutrients in the context of prolonged activity. Muscular strength refers to the maximum amount of force a muscle can produce in a single effort, while anaerobic power deals with short bursts of high-intensity activity that do not rely on oxygen. Flexibility pertains to the range of motion in the joints and does not relate directly to the delivery of oxygen and nutrients during extended physical exertion.