By A Mystery Man Writer
The number of washboard abs you can show is determined by your DNA, according to research.
Does someone with a 8 pack have a stronger core than someone with a 6 pack? - Quora
Is it true that some people will only ever have 4 or 6 pack Abs, never an 8 pack, no matter how hard they train or how low they reduce their body fat? - Quora
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シックスパック」に腹筋が割れる人は遺伝的に全体の60％しかいない｜ニフティニュース