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If you have been looking for an answer to how to gain weight fast, you need to prepare yourself for it and take up the challenge. Are you one of the those skinny boys who have fast metabolism and no matter how much you want to, you cannot gain weight. How to gain weight fast for boys? There is no magic trick but some things that can ensurethat you’ll do it in some time. Putting on weight is equally difficult as losing weight. If you are up for 10-day weight gain challenge, here’s everything you need to find on how to gain weight for boy in 10 days naturally.