Who can make their pecs flex up and down. Do you need to be a body builder in order to do it? Or can you be a moderately fit beer drinking fool and still do it. I can't ... so I ask.
not genetic. try to concentrate and see what muscle it is. flex it while lifting sth and then try to find the muscle without any weight. it's pretty easy once you found that certain nerve!
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^^^KNOWN TO STAND ON THE BAR AND FLEX HIS "CHESTICLES" AFTER SEVERAL DAQUIRIS^^^