You said that although you are still a little far from the rake's heart rate, you really can't run. This shows that it has nothing to do with ambient air humidity, oxygen content and breathing rhythm, but should be related to the latter three.
There are many kinds of aerobic exercise, so you should use the one that suits your physique and pay attention to the matching order.
If you seldom exercise before and your physique is not very good, when you do aerobic exercise, it is easy to cause your heart and lungs not to get good exercise but your muscles are full.
You might as well try to change the collocation of your sports content. At the same time, exercise with some equipment. When exercising, don't pay too much attention to time. Because everyone's physique is different, the effective exercise time is also different. You can take a step-by-step approach and gradually increase the exercise time under the condition that the heart, lungs and muscles can bear it well. In addition, it is necessary to give priority to collocation nutrition and control food intake. Eat more milk, eggs, fruits and vegetables, six meals a day. I also have enough will and courage to face the muscle aches after each exercise.