What type of exercise primarily utilizes anaerobic pathways?

The focus on anaerobic pathways is key when considering exercises that are high in intensity and require quick bursts of energy, which is characteristic of weightlifting. This type of exercise primarily utilizes the body's anaerobic energy systems, specifically the ATP-PC system and glycolysis, to fuel short, explosive efforts. In weightlifting, athletes typically engage in repeated short-duration efforts that demand maximum effort, relying on the stored energy in the muscles rather than on oxygen supply.

On the other hand, endurance running, marathon running, and yoga primarily depend on aerobic energy pathways. Endurance activities like running, especially over longer distances like a marathon, necessitate sustained energy production, which relies heavily on oxygen consumption to meet prolonged energy demands. Yoga, while beneficial for flexibility and strength, usually falls within a low-intensity aerobic framework.

Thus, the anaerobic nature of weightlifting makes it the correct choice, as it exemplifies activities that engage short, intense bursts of energy rather than prolonged aerobic effort.