Globally, hypertension, tobacco use, and hyperglycemia account for 12.8%, 8.7%, and 5.8% of deaths, respectively; lack of physical activity is the fourth leading risk factor for death, with a rate of 5.5%. In response to this important chronic disease-related behavioral risk factor, the World Health Organization published the Global Initiative on Physical Activity for Health, which proposes an appropriate amount of exercise for different age groups. Nowadays, Beijing residents, especially some young people, who work in office buildings, spend too much static time, even up to 23 hours a day. As a direct result of this lifestyle, the locomotor system, especially the knee joint, ages prematurely and joint pain occurs with the slightest movement. Therefore older people should remind their children to walk after reading my article. Children 5-17 years old Physical activity includes play, games, physical activity, transportation to and from, recreation, physical education classes or planned exercise within the home, school and social environment. (1) Should accumulate at least 60 minutes of moderate to vigorous physical activity per day. (2) Physical activity greater than 60 minutes may provide additional health benefits. (3) The majority of daily physical activity should be aerobic, while high-intensity physical activity should be performed at least three times per week. Adults 18-64 years of age (1) should complete at least 150 minutes of moderate-intensity aerobic physical activity per week, or a cumulative total of at least 75 minutes of high-intensity aerobic physical activity per week, or an equivalent combination of both moderate and high-intensity activity. (2) Aerobic activity should last at least 10 minutes at a time. (3) For additional health benefits, adults should increase aerobic activity to 300 minutes per week of moderate intensity or 150 minutes per week of vigorous aerobic activity, or a combination of both moderate and vigorous activity equivalents. (4) Muscle-strengthening activities involving large muscle groups should be performed at least 2 days per week. (1) At least 150 minutes of moderate intensity aerobic physical activity or a total of at least 75 minutes of high intensity aerobic physical activity, or an equivalent combination of both moderate and high intensity activity, should be completed each week for older adults aged 65 years and older. (2) Aerobic activity should last at least 10 minutes at a time. (3) To obtain additional health benefits, adults in this age group should increase aerobic activity to 300 minutes per week of moderate intensity or 150 minutes per week of vigorous aerobic activity, or an equivalent combination of both moderate and vigorous activity. (4) Older adults who are less active should have at least 3 days per week of activities to enhance balance and prevent falls. (5) At least 2 days per week should be devoted to muscle strengthening activities involving large muscle groups. (6) Elderly people who are unable to complete the recommended amount of physical activity for health reasons should be as active as their abilities and conditions allow.