General

How gain weight

First off I'm a male.
What do you do to gain weight? I'm underweight... and super thin.
I eat so much food, and I just don't gain anything.
I hate looking like a stick, it's one of my most hated things.
I also [i]hate[/i] getting called anerixic.
I also have part of my chest that sticks out because of how thin I am, and partly scoliosis... Is there anyway to gain weight over that and hide it?
So, Whats an easy way to gain weight...