Fitness itself does not lead to obesity or emaciation, which is determined by the function of your body organs, your diet and living habits, and your metabolic rate. Generally speaking, when the body consumes more energy than it takes in, it will become thinner, and vice versa. After fitness, due to the high blood sugar consumption in the body, hunger often occurs. So it is normal to eat more than usual. If your fitness goal is to gain muscle, eat more food rich in protein after half an hour; If you want to lose weight, eat after 1 hour.