For an athlete engaging in marathon running, aerobic system of body is predominantly involved in energy production.
The aerobic system is that the predominant energy system used for races lasting longer than 3 minutes. Since distance running is primarily restricted by the delivery and use of oxygen, most of your coaching ought to concentrate on rising your aerobic system's ability to produce oxygen to your running muscles.
The predominant energy system getting used at rest is that the aerobic system. The predominant energy system used throughout the marathon relies upon the intensity and length and therefore the athlete's levels of fitness.
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