Don't we all want our arms to look great? A couple of specific bicep training videos:  So - some impressive biceps there. But remember that the larger muscle in the upper are is the tricep! Of course, there are loads of variations on arm exercises, especially useful are dips. But back to the pix:  

They were just ordinary guys - who decided to do something about their overall fitness and thus, by default, their body image. And all of them mightily pleased by the result. You are welcome to join the club. He's just 14. And he knew what he wanted. Just commit.