Its total energy consumption is not low, because the power of anaerobic energy supply system is very high, much higher than that of aerobic system, so the total energy consumed by crossfit at the same time is obviously much higher than that of aerobic exercise at the same time. Although crossfit mainly consumes sugar in exercise, its fat-reducing effect is still good, mainly for several reasons: 1. After high-intensity HiT exercise, catecholamine in the body increases, which leads to the increase of other hormones, the improvement of people's basic metabolic level and the ability to oxidize fat for a period of time. 2. The suppression of appetite leads to people who don't want to eat too greasy food after this exercise, which reduces the intake after exercise. 3. Promote the transformation of white fat into brown fat in the body, so as to increase the catabolism of fat.