A good physical examination can go to the Affiliated Hospital of Sun Yat-sen University, where there is a special physical examination center and various packages for you to choose from, but it is a bit expensive. If you want to go cheap, you can go to Guangzhou Health and Epidemic Prevention Station, next to the popular front line.
It is very efficient now. You can go as early as possible and get the results in the afternoon. Be careful not to eat in the morning and leave as soon as you get to work. You can consult or make an appointment first if you want to go.