Aerobic exercise does not simply refer to aerobic exercise, but refers to any rhythmic exercise with long exercise time (about 15 minutes or more) and moderate or above exercise intensity (75% to 85% of the maximum heart rate). Whether it is "aerobic exercise" is measured by heart rate. The amount of exercise to keep the heart rate at 150 beats/min is aerobic exercise, because the blood can supply enough oxygen to the myocardium at this time; So it is characterized by low intensity, fast pace and long duration.
There are many ways to exercise by cycling in situ, depending on your intensity. Simply put, it is the speed at which you pedal.