① Generally, aerobic exercise depends on the heartbeat. As long as the maximum heart rate is above 60% and lasts for 30~45 minutes, aerobic exercise mainly uses fat and carbohydrates to provide energy. After 30 minutes, the utilization rate of carbohydrates and fats will reach a golden cross. So aerobic exercise is effective if it lasts for 30~45 minutes.

② Compared with aerobic exercise, anaerobic exercise has higher muscle load, greater difficulty and higher risk of sports injury. At this time, it is very important to evaluate how far you have reached.

Generally speaking, in traditional weight training, there are many different combinations and exercises, such as high weight, low frequency, low weight and high frequency. Each exercise has a different purpose.

Whether it is unarmed training, interval training or weight training in the gym, the most important thing to pay attention to is whether you use the muscles you really want to exercise, whether you use excessive compensation, and whether you choose actions, weights or schedules that you can't afford.