After the start of fitness, because more calories are metabolized every day than before, the body's fat will be decomposed, which of course everyone likes. But at the same time, exercise can activate muscles, which means that your muscles lack training before. After you start training, more water will enter your muscles, thus increasing your weight.

The decomposition of fat and the increase of muscle weight will cause little or no change in weight, or even increase. So don't use weight figures to evaluate your training effect, because muscle gain will bring more health and better body shape. After a period of time, the visual effect of body shape will be better.