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http://quicksupplementfact.com/massive-testo/ - jtkr558 - 09-23-2017 07:54 PM
In addition, all motor units of one muscle are never activated at a time. Thus we do not contract muscles, we contract groups of muscle fibers controlled by motor units. Muscle is a name that we put groups of muscle fibers that are nearby, to be able to classify and study them better. It is a classification system created by us, not as the brain sees it.