Phytolast You see, even though the penis is not a muscle, growth occurs in much the same way a muscle group grows. In order to grow big biceps, for example, you need to exercise your arms three or four days a week. Exercise tears down the cells within a muscle group, and it then repairs itself during rest days. These rest days are when growth begins, as the cells grow back bigger and stronger. Penile exercise tears at the cells of the corpora cavernosa, or two large chambers that fill with blood during an erection. 

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