If it's cardio, do it first thing in the morning on an empty stomach. Wake up, have a tall glass of water, and start your exercise. Wait 30-60 minutes after your cardio is done before eating breakfast.
If you're doing weight training, you should aim to have a high protein meal no more than 1 hour prior to your weight training. Your weight training session should last no more than 1 hour. As soon as you're done, you should have a recovery drink that is high in simple carbs. This is necessary to replenish your muscle glycogen and prevent muscle breakdown. Within one hour of ending your workout, you should have a high protein meal.
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