I am 24 yrs old ladies, I am very thin 37kgs I need to be fat until I became 45kg so what shall I do?

Sweetie you don't want to get fat or gain weight trust me.I was a skinny girl and thought the same thing and now I am trying to get rid of this weight.Love you for you!:)

There ara a lot of ways to gain weight, first you need to track how many carbs you eat, once you no that double them per day, that's a good start there are tons of weight gaining products out there. If you have a high metabolism like I do make sure you eat before and after you workout, you don't need a whole lot of cardio workout, your just trying to put on weight but you want it to be healthy weight. You must workout or it will just be fat, and unhealthy.