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It more means he started a business he was passionate about, as this was his goal. And with this being your sole focus, you are inevitably going to garner a level of expertise on the subject.
Yeah, metabolism, personal fitness levels, diet, rest is one of the most fundamental factors in muscle growth. Muscle grows during resting periods, so regulating your workout/rest ratio based on how your body reacts best can produce way way way more rapid results than someone who thinks 'I wanna get big, I'm just going to spank the gym every day until my veins pump fire'
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