Refers to a kind of sports activity in Chinese mainland, also known as two exercises and one exercise. Two exercises and one activity refer to two playground exercises and one group exercise every day. Playground sports refers to the collective sports on the playground, which usually includes a series of body exercises, aerobics, dance exercises and so on. , aiming at improving physical fitness and health. Group activities refer to some group competitions, games or other forms of group activities aimed at enhancing the sense of teamwork and unity. This activity is usually carried out in schools, enterprises, institutions, communities and other places.