im 13 years old and im strong but skinny i weight train 3 days a week and jog and work my abs everyday, I concentrate on arms. I use barbells and dumbells equally but my arms just get harder and firmer but not bigger I eat well. 
Am I doing something wrong, to make them not grow
 
 
							
						
					Am I doing something wrong, to make them not grow
 
							
						

   Kinda weird though,  who could anyone ever think that sweating is fun..
							
						
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