I don't know if you have caught a cold after high-intensity strenuous exercise. In fact, this is the direct result of high-intensity exercise, because lymphocytes will rise sharply during high-intensity exercise, but they will drop sharply after exercise and remain unbalanced for a period of time. The resistance to virus is very weak, so it is particularly easy to catch a cold.
2. It is very harmful to the heart.
When we exercise vigorously, our heart beats faster, which leads to the overload of our heart. If you do high-intensity exercise for a long time, it will bring some damage to your heart.
3. Emotions may become more and more depressed.
Long-term high-intensity training will make your nerves in a state of extreme tension, and you will feel tired, unable to sleep, loss of appetite, insomnia, dreaminess and so on. If you persist in training at this time, it may also lead to a series of complications, such as autonomic nervous disorder, exercise-induced hypertension and so on.
4. It is likely to cause muscle strain.
Whether it is warming up in advance or protecting some joints, high-intensity exercise is likely to cause some muscle strain to us. The reason is very simple. Sudden high-intensity exercise will make our muscles feel uncomfortable, which will definitely cause muscle strain or tendon tissue strain. In this case, the loss outweighs the gain.
To sum up, I feel that if you continue to do high-intensity strenuous exercise, you might as well not exercise, just like the old saying goes, extremes meet.