If you don't concentrate, do aerobic exercise first, then do anaerobic exercise. If you feel very tired, then do strength training, your experience will be poor, and you will not be able to achieve the effect of strength training, which will easily lead to muscle strain and sports injury.
Therefore, if you want to gain muscle, you must do anaerobic exercise in a state of concentration. Conversely, in order to lose weight, you need to consume more calories, but when the body starts to exercise, the oxygen supply can't keep up, and sugar and fat are not fully utilized. It's just that the time is prolonged, and fat mobilization will start after about 20 minutes to half an hour. Therefore, doing anaerobic exercise first, consuming some sugar and then doing aerobic exercise can make the body directly enter the process of burning fat, and fat consumption will be faster.
Therefore, no matter from the safety of muscle gain or the effectiveness of weight loss, it is recommended to do anaerobic exercise first and then aerobic exercise.