Which type of exercise is predominantly anaerobic?

Weightlifting is predominantly anaerobic because it primarily relies on energy systems that do not require oxygen for fuel. This type of exercise involves short bursts of high-intensity effort—typically lasting from a few seconds to a couple of minutes—where the body primarily uses stored energy sources like ATP (adenosine triphosphate) and phosphocreatine rather than oxygen-dependent processes.

Anaerobic exercise is characterized by activities that develop strength and power, usually performed in a way that does not allow the cardiovascular system to provide enough oxygen for sustained effort. Weightlifting fits into this category as it involves maximal effort exerted in lifting weights over short durations, leading to changes in muscle mass, strength, and performance.

In contrast, activities like running a marathon, cycling, and swimming involve prolonged durations of moderate to high-intensity exertion that use the aerobic system, where oxygen is utilized to produce energy.