If you would like to gain weight fast, aside from resistance training, eating the right food is paramount.
The first step is to discover what those foods are.
You’ll learn what some of those are in this video.
Once you learn which foods will help you gain weight, the only thing left is to figure out how many calories you need to create a caloric surplus and then plug in those foods into your diet to help you reach it.
Again, in this video, you will find a list of foods that will help you gain weight fast.
Combine them with resistance exercises and training and watch how much and how fast you gain weight.