Which of the following is an example of an aerobic exercise?

Aerobic exercise involves activities that increase your heart rate and improve the efficiency of your cardiovascular system. Running and cycling are prime examples of aerobic exercises because they require sustained, rhythmic movement and use large muscle groups, often leading to enhanced endurance and increases in heart and lung fitness. These exercises can be performed for extended periods and typically utilize oxygen to fuel the body.

In contrast, activities like yoga and Pilates focus more on flexibility, balance, and strength without significantly elevating the heart rate for an extended duration. Weightlifting, while physically demanding, primarily builds muscle strength and involves short bursts of effort rather than sustained activity, making it more anaerobic in nature. Therefore, running or cycling is the best representation of aerobic exercise among the choices provided.