Gaining weight properly is so important for body. There are so many executrices for it. You can joining gym. Eat the food with lots of protein and calories. Take daily 150-170 g protein if you want to build muscles. It is different for man, woman and child. Here some tips for gaining weight :

1. Protein is important for body.

2. Eat food in which more calories.

3. workouts daily.

4. Proper Work-out.