First of all, go to bed early and get up early and go to sleep before 10 pm. The traditional Chinese medicine has a theory that the liver is ditoxicating the blood from 10pm to 1am， so you need to rest before 10pm. Getting up early will make you feel you have two more hours than others，so you can be more efficient and productive which would make you feel good about yourself. In addition，having a healthy diet is very important to staying fit，so try to cook more at home and order less take-out food，it's very economical and part of a healthy lifestyle. To be more specific，you can cook more vegetables instead of rich food. When you order take-out food，you may find the food is usually too oily and you can't control it. Last but not least, aerobics are helpful for staying fit. Aerobic exercise gets the heart pumping and helps you burn up fat. So you can go jogging or take a walk whenever you are free，in order to burn more calories. What do you think？