Which of the following is an example of anaerobic exercise?

Anaerobic exercise is characterized by short bursts of high-intensity activity where the body relies on energy sources stored in the muscles rather than on oxygen intake. Weightlifting exemplifies anaerobic exercise because it involves lifting heavy weights in short durations, typically leading to muscle fatigue and requiring recovery periods. This type of exercise focuses on building strength, power, and muscle mass through resistance training.

In contrast, marathon running and swimming are primarily aerobic activities, where oxygen is used to fuel long-duration exercise at steady states. These exercises enhance cardiovascular endurance. Yoga, while physically demanding and beneficial for flexibility and strength, does not typically include high-intensity effort that requires energy production in the absence of oxygen, which is a key feature of anaerobic exercise. Therefore, weightlifting stands out as the quintessential example of anaerobic exercise.