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

How We Went From Skinny to Muscular (+70 Pounds of Muscle)

What does skinny muscle look like? How do you know if you have it? - Quora

How We Went From Skinny to Muscular (+70 Pounds of Muscle)

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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?

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