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Background: The physical activity and health status of the students in China are not optimistic, there is a general lack of exercise volume and exercise intensity. Normal college students shoulder the future of China’s education. Promoting their physical health is the basic requirement for cultivating teachers in the new era;Methods:Testing and recording 1123 male, 3266 female college students’ physical fitness indicators in a normal college, the relationship between these indicators was mined by correlation analysis and Apriori, and the intelligent prediction models was constructed according to the mined knowledge;Results: There was no correlation between male 1000m running and vital capacity (P > 0.05), but it was correlated with vital capacity weight index (P < 0.05); Most indicators of women showed varying degrees of correlation. There are many association rules between female 50m sprint and standing long jump, sit-ups, and BMI. The introduction of vital capacity weight index slightly improved the accuracy of the 1000m run prediction model; The prediction model of female 50m sprint with standing long jump, sit-ups and BMI as inputs not only keeps the accuracy in a reasonable range, but also reduces the complexity and parameters;ConclusionsFor male students, the ostensibly paradoxical relationships between vital capacity and a 1000 meter run and between vital capacity and pull up were actually due to body shape; Body shape, lower limb explosive power, and core strength play key roles for female college students’ speed quality; BMI, standing long jump and one minute sit-up can be used to predict the 50m sprint performance of general female college students.

Breaststroke is an important sub-item of swimming. Its academic research plays an irreplaceable role in China's physical education and Olympic competitive sports. In order to further understand its current research status of breaststroke in China and summarize the research hotspots and directions, this paper adopts the bibliometric method based on data mining. This paper makes a visual analysis of 1975 breaststroke documents included in CNKI from 1989 to 2021 and the development process, hot spots, and evolution trend of breaststroke research. The result shows that the breaststroke papers as a whole show a "ladder" fluctuation evolution in quantity; the research affiliations of breaststroke are mainly sports colleges and universities. Beijing Sport University and Guangzhou Institute of physical education are the backbones of academic research in this aspect. Its research hotspots include “swimming”, “individual medley” and “swimmer research”. The number and sources of overall research topics are relatively limited, and the research topics are scattered. It is suggested to strengthen basic theoretical research, strengthen interdisciplinary integration and explore research perspectives; strengthen scientific cooperation, enhance discipline integration, and pay attention to the diversity and scientificity of micro empirical research methods.