Physical Activity Guidelines for Chinese (2021) is composed of seven parts, including the general guidelines, children aged 2 years and below, children aged 3-5 years, children and adolescents aged 6-17 years, adults aged 18-64 years, the elderly aged 65 years and above, and patients with chronic diseases. The guidelines is instructed by the Bureau for Diseases Prevention and Control of the National Health Commission, led by the Chinese Center for Disease Control and Prevention and China Institute of Sport Science and completed by the Composing and Editorial Board of Physical Activity Guidelines for Chinese.