Weight gain after exercise, it is possible that fat is converted into muscle, muscle will make weight gain because muscle is heavier than fat; do not drink too much water after exercise, otherwise it will also cause weight gain; some exercisers eat a lot after exercise, eating too much will also cause weight gain. So the specific situation should be judged according to the sportsman exercise project and time, sportsman fat loss, muscle gain, exercise heart rate, shape fiber degree, etc. to determine their fat and thin, do not weigh pounds to determine whether weight loss success.