Packing on muscle can be done in two steps: lifting weights and eating more. When you workout, you cause tiny tears in your muscles that are later repaired which is what makes you bigger, faster and stronger. When your body is repairing, it’s in an anabolic state. To gain the most weight, you need to keep your body from going in the opposite direction, what’s known as a catabolic state – when your body is breaking tissue down. The longer you can keep your body in an anabolic state, the more muscle you’ll build and the quicker you’ll gain weight.