What would I have to do to gain muscle ?

Okay I'm really skinny 120 pounds 5'8 I am wondering what would I have to do to get in shape pecks big arms well not big but like a reasonable size I have no chest and little arms what kind of excerisises do I have to do for a guy in my shape to gain muscle ? What kind of excerisises daily or regularly... show more Okay I'm really skinny 120 pounds 5'8 I am wondering what would I have to do to get in shape pecks big arms well not big but like a reasonable size I have no chest and little arms what kind of excerisises do I have to do for a guy in my shape to gain muscle ? What kind of excerisises daily or regularly please help?
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