This is because the two principals actually supplement each other. By runing at a comfortable pace (aerobic pace), you can cover longer run. By doing longer run, you can then accumulate high mileage without set-backs due to injuries. By running more, you burnt more calories, further reducing more weight. And, by reducing more weight, you increase your aerobic capacity. So the improvement goes on. The relationship between Aerobic Capacity, Body Weight and Aerobic Fitness is expressed in the following scientific formula:
Aerobic Capacity = Oxygen consumed per min Body Weight |