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Muscles depletes their “fast” energy sources – creatinephosphate and glycogen. Due to passing anaerobic processes of energy supply, chemical structure of muscle fibers changes. ADP (adenosinediphosphate), creatine, H+, lactate increase. These substances are spoiling muscle cells. Besides, some damage of muscles cells takes place. Nervous system takes heavy load. Central nervous system feels significant stimulation during workout, which turns to great inhibition as fatigue increase. Enormous intensity of neural signals to the muscles leads to fatigue of neurons. Neural signals between neurons and muscles start to fail. Endocrinal system also takes its part of stress. First, it needs to produce dozens of hormones that allow recreating energy urgently. Next, body needs hormones to repair and reconstruct muscles, damaged through workout.</quote>
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Muscle cannot change its shape. It cannot get bigger with one part, get longer or shorter. If muscle grows, It grows entirely, with every fiber. When you see all these bodybuilders, standing on a scene with absolutely different biceps, legs and chest, it means that they don’t used unique workouts, but have different genetics. Everybody does same exercises but result depends from our parents’ heritage.</quote>