Eat more beef. . You can increase your muscles and often go to the gym. You are a soldier now. Being a soldier requires a strong physical quality. Don't just gain weight. You should train reasonably and gain muscle. If you can gain a few pounds a month, you won't be so tired when you train as a soldier. Or if you weigh less on the day of the military inspection, eat more and drink more water. The weight difference between after meal and before meal can reach about 1 kg.