According to legend, this is because Tomb-Sweeping Day wants to ban cold food and fire. In order to prevent the harm of cold food and cold meal to people, we all take part in some sports activities to exercise.
Extended data
Tomb-Sweeping Day custom refers to the custom of sweeping graves to worship ancestors and going out for an outing before and after Tomb-Sweeping Day. Tomb-Sweeping Day is one of the important traditional festivals in China. It is not only a festival for people to pay homage to their ancestors and cherish the memory of martyrs, but also a link for the Chinese nation to recognize their ancestors and return to their ancestors. It is more important to know your ancestors, see your own shortcomings, correct yourself and drive future generations.
Realize the value of life, remove the dead leaves left by our ancestors, keep the new buds that can be used for reference, and promote positive energy. From generation to generation, the clear revision date is April 4-6 of the solar calendar every year.
reference data
Tomb-Sweeping Day Customs _ Baidu Encyclopedia