Theoretically, as long as the intensive fitness training (excluding warm-up and relaxation) does not exceed 70 minutes, there is no need to eat during the fitness process. If it exceeds, you can add some digestible food in the middle, but it is not recommended to practice for too long. It is best to drink protein powder within half an hour after training. At this time, the body needs energy and protein most. If you drink a little protein powder at this time, you can effectively accelerate muscle recovery and reduce muscle pain and fatigue after training. I hope I can help you.