Do anaerobic exercise first, because anaerobic exercise is basically a kind of exercise with high load intensity and strong immediacy, which requires high physical strength. After aerobic exercise, do anaerobic exercise, the physical strength can't keep up, the training can't reach the intensity, and the stimulation to muscles is small.

If you want to gain muscle, don't do aerobic training yet. You should separate aerobic exercise day from anaerobic exercise day. It is best to take a day off before aerobic exercise, such as anaerobic weight-bearing exercise for one day, aerobic exercise after one day off, and anaerobic weight-bearing exercise for another day the next day or the next.