I feel I can exercise best at least two hours after a meal and ideally three. It feels like vigorous exercise is interfering with my digestion if it's too close to a big meal. I don't have as much energy to workout as I'd like to before breakfast.
One thing I love to do close to after a meal though is take a long walk. This works especially well when the only time I have to exercise that day is right after eating. And while it's not convenient for me to do this now, I've enjoyed a brief walk before breakfast at times as well.