There are three metabolic pathways that provide the energy for all human action. These “metabolic engines” are known as the phosphagen pathway, the glycolytic pathway, and the oxidative pathway. The first, the phosphagen, dominates the highest-powered activities, those that last less than about ten seconds. The second pathway, the glycolytic, dominates moderate-powered activities, those that last up to several minutes. These are the “anaerobic” pathways. The third pathway, the oxidative, dominates low-powered activities, those that last in excess of several minutes. This is the aerobic pathway. - CrossFit
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