Help: Is it okay to exercise in the morning on an empty stomach? How long should I wait to exercise in the evening after a meal, and what time of day should I not exercise in the evening? The answer to this question is scientific. Morning exercise is not scientific, exercise on an empty stomach is not scientific, in fact, the best time of day to exercise is 10 a.m. to 10 p.m., which is why most of the game in the afternoon or evening reasons. After eating 30 minutes after exercise is appropriate, because at this time the peristalsis of the stomach is not active, there is more blood involved in the supply to meet the needs of your movement, and finally I wish you to grow to the desired height.