Which type of exercise would primarily use anaerobic metabolism?

Anaerobic metabolism predominantly takes place in situations where energy is required quickly and in large amounts, typically during high-intensity activities that last for a short duration. In the case of sprinting or high-intensity interval training, the body primarily relies on anaerobic pathways, as these exercises involve short bursts of effort that cannot be sustained for long periods without fatigue.

During such activities, the oxygen supply available to the muscles is insufficient to meet the rapid energy demands; hence, the body relies on stored energy sources, such as phosphocreatine and anaerobic glycolysis, to produce ATP quickly. This form of energy production leads to the generation of lactate, which is characteristic of anaerobic metabolism.

In contrast, the other options involve lower intensity or longer-duration activities where the body can utilize aerobic metabolism, which requires a steady supply of oxygen and is more suited for prolonged activities where energy demands are met through the oxidation of carbohydrates and fats.