It's too cold. What sports can I do?

Hello, it's too cold to go out for exercise before the sun comes out. Morning exercise and exercise should not be carried out in foggy and rainy days, but after the sun comes out, so that harmful substances in the air will be reduced, and moderate exercise is good for the body. And the air quality is good in winter. It is recommended to do moderate exercise, such as yoga and running in situ.