Easy days are easy, for the simple reason your need to recover from a heavy load. Not only will running faster result in diminished aerobic development, but it increases the chances of injury and overtraining. So why doesn’t running faster on easy days develop the aerobic system more rapidly? There is a time and place for track workouts, VO2max sessions and tempo runs however, nothing will consistently help you improve like developing your aerobic system. Given this, aerobic development is the single most important factor to long-term development for distance runners and athletes. There are other physiological benefits to aerobic training, but the three major factors above are the primary contributors. Aerobic training increases both the number and the size of the mitochondria in your muscle fibers. So it’s a given, the more mitochondria you have and the greater their density, the more energy you can generate during exercise.
In the presence of oxygen, mitochondria breakdown carbohydrate, fat, and protein into usable energy. Mitochondria are microscopic organelle found in your muscles cells that assist in the production of ATP (energy).
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