Winter morning is a cold time of the day. When the sun doesn't rise, the air is poor, and because people just get up, the human body has not adapted to the cold environment. If we do outdoor sports at this time, it will not only bring health to sports, but also suffer from it.
It is best to do morning exercises after the sun comes out at nine o'clock in winter. The air is not so cold at this time, and the air index is also a better time. It is recommended not to do too much exercise and strenuous exercise in winter because of the large temperature difference. Excessive exercise and sweating easily make people feel uncomfortable.