Judging from your weight and height, you can gain weight and exercise your chest muscles. I don't know if you will go to the gym. If not, I suggest you buy a bench to exercise pectoralis major or have a narrow bench and a pair of dumbbells. You can also exercise your chest muscles for your abdominal muscles three times a day, but you don't eat much. Boiled eggs with milk and oatmeal in the morning can be fried, and 10 can eat less fruit. You can eat more fruit at lunch and have a cup at 3: 00. Yogurt can eat bread at 5 o'clock, even if it is dinner. Eat more vegetables and less meat at 7 o'clock in the evening. You can add more carbohydrates and drink Gatorade after more exercise. Oh, very good. Eat a few eggs until 9 pm, then eat some fruit and drink a glass of milk.