In order to gain weight, you need to start eating 5-6 meals a day. However, it is important that you break these meals into parts, as eating a lot at once may result in indigestion and your body may not be able to absorb all the calories. It may be possible that you won’t find yourself hungry 3 hours after eating lunch, but eat anyway and notice how your appetite increases from day to day. Also, be sure to include healthy foods in your diet for a healthy weight gain.
Do weight training at least 3 times a week
When you train with weights, your muscles will grow.
Also, it is important that you gradually keep increasing the weight with which you train. As you train, your strength will increase and you shouldn’t find it exceptionally difficult to do so. For instance, if you are doing lateral pulldowns with 30 kilos of weight, try and increase it to 35 kilos the next time.