2. Teenagers: Teenagers (mainly students) have always been the backbone of the fitness crowd because of their energy and competitiveness, but their fitness methods are mainly sports activities that can be carried out on campus, such as running, long jump, high jump, pull-ups, basketball, football and badminton.

3. Middle-aged and elderly people: The family life of middle-aged and elderly people is relatively stable and regular. Due to the growth of age and the hard work when they were young, their physical fitness has declined. Only with a sense of crisis do they want to have time and energy to exercise.

4. Young and middle-aged: Young and middle-aged people here refer to people whose age spans between teenagers and middle-aged. They are probably over 25 years old and have been working until they are under 40 years old. This group is young because their work has just started and their thoughts fluctuate greatly. In addition, for the sake of work and the future, and because people are young and can persist, not many people spend time exercising. The elderly in this crowd spend a lot of energy because of their busy work, children growing up and elderly parents, so there are not many people who are willing to take the time to exercise.