There are two situations. First of all, there is more fat and less muscle, so it will shake. The second is that muscles will age and relax with age, which is natural. However, everything can be solved by exercise. Pay attention to diet, eat less greasy food, eat more protein, ensure the normal intake of trace elements (normal diet is enough, not picky eaters), and insist on exercise. In addition, pay attention to the ways and means of exercise, and correct and purposeful exercise is feasible. The correct method can be consulted by professionals.