You can't delay exercise because you go to work, because your body is the capital of the revolution, and you can exercise before you go to work. Morning is the beginning of the day, and the time is relatively short. Generally, the working hours are after eight o'clock, so you can go to work at six or seven in the morning. It is not too early to calm yourself down before going to work, and you will not feel sleepy during the day. So running before work is a good choice.