In fitness, it is a common fitness principle to carry out strength training first and then aerobic training. The main reasons are as follows:

1. Ensure that muscles can withstand the load of aerobic exercise: First, strength training can enhance muscle strength and endurance, help the body better adapt to the load of aerobic exercise, and avoid injury due to insufficient muscle strength.

2. Improve metabolic rate: Strength training can increase muscle mass. Muscle is a tissue with high metabolic rate and needs to consume more energy to maintain its physiological function. Therefore, increasing muscle mass through strength training can improve basal metabolic rate, thus accelerating fat burning and helping to reduce fat. If aerobic exercise is carried out before strength training, the body will consume glycogen first, which will lead to the inability to exert its maximum strength during strength training. First, strength training can consume glycogen, thus improving the effect of strength training.

3. Improve fat burning efficiency: At the beginning of exercise, the body mainly mobilizes glycogen to participate in consumption, and the amount of fat involved is very small. Generally, after about 30 minutes of exercise, glycogen consumption is almost the same, and the participation of fat will reach the maximum. In fitness training, strength training can consume glycogen, and then aerobic exercise can make the body enter the state of burning fat faster and improve the speed of losing weight.

In a word, it is a common fitness principle to carry out strength training first and then aerobic training, which is helpful to improve fat burning efficiency, enhance muscle strength and endurance, and improve metabolic rate. But the specific order should be adjusted according to personal situation and fitness goals. It is suggested to carry out fitness training under the guidance of professional coaches.