Requiring high school students to participate in community service is beneficial to their physical health. This is because community service involves a large amount of physical activity which discourages young people from having sedentary lifestyles. For example, they are often required to sweep neighborhood streets, mow lawns for the elderly, and teach sports to young children. If they were not asked to engage in these activities, they would be likely to spend their spare time in the virtual world or continuing to read and study, which can cause common diseases, such as obesity and myopia.