Which of these is the best example of an aerobic exercise?

Aerobic exercise is sustained, moderate-intensity physical activity that relies on the aerobic (oxygen-using) energy system. It requires the heart and lungs to continuously supply oxygen to working muscles over an extended period. Jogging for 30 minutes at a steady pace is the best example because it is a prolonged, rhythmic activity performed at a moderate intensity that keeps the heart rate elevated within the aerobic training zone.

The other options describe anaerobic activities, which are short, intense bursts that rely primarily on energy stored in the muscles without sustained oxygen delivery:

• Jumping as high as possible is an explosive, one-off power movement lasting only seconds.
• Lifting a very heavy weight once is a maximal-effort strength activity relying on the phosphocreatine energy system.
• Sprinting for 50 metres is a high-intensity, short-duration effort fuelled primarily by anaerobic glycolysis.

Exam tip: The hallmarks of aerobic exercise are sustained duration, moderate intensity, and continuous oxygen use. If the activity is over in seconds or requires maximal effort, it is anaerobic.