Weight gain after exercise is mainly related to the ratio of intake and consumption, and the corresponding reasons mainly include too little exercise, too much food or increased muscle mass. 1. Exercise too little: the amount of exercise is relatively small, during which the body’s consumption does not exceed the amount of food intake, it will lead to weight gain. 2. Eating too much: Although the body produces a certain amount of consumption when participating in sports, it can still lead to weight gain because of eating too much. 3. Increased muscle mass: mainly occurs in the fitness crowd, through the exercise increased muscle mass, will also appear weight gain. To control weight, the main thing is to increase the amount of exercise and reduce the amount of food intake, in order to ensure the health of the body, reasonable exercise and diet, if necessary, under the guidance of a professional doctor to reduce weight.