Which of the following is listed as an aerobic exercise?

• A. Sprinting
• B. Rowing machine
• C. Stair climbing
• D. Running on a treadmill

Answer: (D)

Aerobic exercise is sustained, rhythmic activity that uses large muscle groups and relies on oxygen to meet energy needs over a longer period. Running on a treadmill fits this pattern well because you can maintain a steady pace for an extended duration, keeping your heart rate in the aerobic zone and using oxidative energy pathways. This steady effort primarily uses oxygen to generate energy, drawing from fats and carbohydrates as fuel.

Sprinting, in contrast, is a short, all-out effort that depends on anaerobic energy systems, producing quick power but fatigue quickly. The rowing machine and stair climbing can be aerobic if done at a pace you can sustain, but they’re also often performed at higher intensities that can tap into anaerobic energy briefly. The treadmill running option is the clearest example of sustained aerobic work.