Which of the following is an example of anaerobic exercise?

Anaerobic exercise refers to physical activity that occurs in short bursts of high intensity, where the body relies on energy sources that are stored in the muscles, rather than relying on oxygen intake. Weight training exemplifies this type of exercise as it typically involves performing repeated lifts or resistance exercises over a short duration, pushing the muscles to exert force without the need for extended oxygen supply. This generates energy from the anaerobic energy systems, which are efficient for high-intensity efforts lasting from a few seconds to around two minutes.

In contrast, running long distances, swimming continuously, and cycling at a steady pace are primarily aerobic activities. These exercises require endurance and involve sustained efforts over longer periods, relying on oxygen to fuel the activity. Therefore, weight training stands out as the activity that fits the anaerobic classification due to its high-intensity and short-duration nature.