Which of the following activities relies more heavily on anaerobic metabolism?

Weightlifting primarily relies on anaerobic metabolism due to the explosive nature of the activity. Unlike aerobic exercises, which require oxygen and are sustained over longer periods, weightlifting involves short bursts of intense effort where the body quickly needs energy. This energy is produced through anaerobic pathways, such as the phosphagen system and anaerobic glycolysis, which do not rely on oxygen and can provide immediate energy for high-intensity, short-duration activities.

In contrast, marathon running, cycling, and walking are predominantly aerobic activities. They rely on oxygen to generate energy over sustained periods and involve slower, steadier efforts rather than the high-intensity, short-duration bursts characteristic of weightlifting.