Insist on running several laps in the track and field in the morning. Be sure to eat breakfast, don't eat lunch or eat a little, just eat at seven o'clock in the evening. You should suck more abdomen when you walk. You can sit up straight in class instead of lying on your seat. You can stand up straight and walk up two stairs at a time. Physical education class does more sports. Eat less fried puffed food. I hope to adopt, because I am also a student.