Obesity is a global public health problem in modern society. Body mass index (BMI) can measure whether a person’s body is in obesity and health. Body mass is the quality of human body, which is a comprehensive and relatively stable characteristic of human body structure, physiological function, and psychological factors, and body mass is the basis of heredity and acquisition. Physical exercise is a kind of physical activity that people do in their spare time in order to exercise their body and mind. In this paper, we take the physical health problem of obesity as the background and combine the fuzzy breakpoint regression method to design the body mass index and physical exercise participation rate. The relationship between the body mass index and physical exercise participation rate design based on fuzzy breakpoint regression in this paper is mainly discussed as follows: background: the obesity rate is rising and chronic diseases caused by obesity affect health; results: jumps were observed for body health indices above 24.9 kg/m2, while participation rates in physical activity decreased compared to the normal weight range; and conclusion: the greater the weight of the group, the less willingness to participate in physical activity and the lower the rate of participation in physical activity.
The issue of population aging is of great concern to all countries in the world, and China is one of the countries with more serious population aging. Under the situation of increasingly serious population aging, we should pay more attention to the life of the elderly after retirement. Paying attention to the health behavior and living conditions of the elderly population will contribute to the process of successful aging. Retirement is a critical point, and the transition period will have different effects on the health of the retired population, with some literature suggesting negative effects on the health of individuals after retirement, and others suggesting positive effects on health. Retirement has caused a lifestyle change in older adults, and few studies have addressed the impact of retirement on individuals’ choices of specific healthy lifestyles, particularly the impact of retirement on physical activity participation. In this study, we used data from the 2015, 2017, and 2018 China Social Tracking Survey (CGSS) to explore the effect of retirement on individual male physical activity participation using the sample size of retired male individuals from the three data periods and using the IV-Probit model. The results showed that retirement had a significant positive effect on individual men’s physical activity participation. In terms of the influence mechanism, physical health, psychological health, active learning during leisure time, and Internet use of retired individuals may be the main reasons for increasing physical activity participation. It provides a channel for China to encourage and support older adults to expand their physical exercise participation after retirement and improve their physical and mental health and to promote the shift of older adults’ postretirement lifestyle toward an active and healthy lifestyle.
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