Which of the following is listed as an anaerobic exercise?

• A. Jumping Jacks
• B. Cycling
• C. Running
• D. Walking

Answer: (C)

Anaerobic exercise is about short bursts of high‑intensity effort where energy is produced without relying on oxygen in the moment. When you run fast or sprint, your muscles need quick energy, so your body uses stored ATP and phosphocreatine and then switches to anaerobic glycolysis to keep going for a brief period. That rapid, high-demand energy supply is the hallmark of anaerobic work. Walking stays at a low, steady pace and mainly uses aerobic metabolism over time. Cycling and jumping jacks can be either aerobic or anaerobic depending on how hard and how long you push them, but a short, fast run clearly fits the anaerobic pattern. So the best answer is running.