If you exercise before breakfast
It is best to exercise 40 minutes before breakfast, from 6 to 7: 30, and then have breakfast 40 minutes later.
If you exercise after breakfast
At least 1 hour later (wait until the food is digested, otherwise exercise will affect digestion, etc. )
But if you start exercising after breakfast, it should be at least 7: 30. After 8: 00, there will be fewer people exercising after meals.
It's morning exercise now, and you should exercise half an hour after getting up, that is to say, between 6: 00 and 7: 30, the air is fresh and the effect is good. An empty stomach, too.
Therefore, it is recommended to exercise (walk) to work before breakfast.
Have breakfast in at least 40 minutes.