13 years old don't worry too much. This period is the golden age of growth and development. If you miss it, you lose it, and you can keep losing weight. That's the suggestion. For this problem

Aerobic exercise begins after 30 minutes of anaerobic exercise, and aerobic exercise should reach 40 to 50 minutes. The purpose of anaerobic treatment is to consume raw sugar water in the body after anaerobic treatment.

Almost began to really burn fat and really consume the energy generated by fat. Losing weight is mainly fat. After anaerobic and aerobic, fat can be consumed earlier, faster, longer and more effectively. Get the best results in one training. Anaerobic refers to dumbbell barbell equipment training, aerobic refers to running spinning elliptical machine skipping rope. At the same time, it is suggested that hiit and insanity should carry out non-intermittent aerobic training with less time and better effect. I hope I can help you.