Hello guys , I am turning 15 in the 2 months , I wanted to ask you something , I live in Serb Republic , play basketball and I am lets say tall , around 186cm or 6ft123in , and my problem is because I am skinny , I have 55kg/121lbs , I don't have problem with some food I eat everything and my meals are often big , but there is another problem my back aren't good I often feel a small pain in it and I have to stretch myself to stop it , it looks weird sometimes,if somebody can help me to get some mass , and fix my back I would be very thankful 

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