First of all, it should be clear that the purpose of anaerobic exercise is to gain muscle, and the purpose of aerobic exercise is to reduce fat.

At the beginning of exercise, glycogen is abundant in the body and ATP is abundant in the muscles. This period is suitable for anaerobic training and can supply energy to muscles quickly, but these energy sources will soon be exhausted. Aerobic training after exhaustion can mobilize the metabolic mechanism of the body more quickly and let the fat begin to decompose, instead of consuming glycogen in the blood. So first anaerobic and then aerobic, get twice the result with half the effort.