If a thin guy builds muscle, can he go back to being thin again

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Can a thin guy make nice muscles if he works out hard? Since his bone size is also small, can a thin guy get more flesh so that his body looks good?

If a thin guy builds muscle, can he go back to being thin again? - Quora

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Who is more likely to build muscles? The skinny ones or the fat ones? - Quora

What is a good example of a thin guy who has an athletic muscular body? - Quora

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