How to gain weight fast? Gaining weight with muscle and not fat

If you are sick of being called skinny all your life, you probably want to gain weight and gain it quickly. Gaining weight is actually pretty easy. You just have to eat more calories that you use up in a day. For example, if your body burns 2,000 calories in a day and eat only 2,000 calories in a day, you are never going to gain a single pound. And if you end up using 2,200 calories in a day inste...

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