The production of lactate, commonly mistaken as lactic acid, is one of the most misunderstood processes of the human body. The formation of this lactate molecule results from the metabolic process known as glycolysis. During activity, the body begins to break down glycogen (sugar) to be used as fuel. This process creates ATP to be used as fuel for the body, but also the byproduct pyruvic acid and eventually lactate. Because large amounts of lactate can be found in fatigued athletes, many people assume it is the cause of the fatigue, but this may not be true.