With the improvement of health awareness, the fitness APP has been widely used among college students. This paper aims to explore the influence of college students using fitness APP on exercise knowledge mastery and exercise willingness based on the CMM (Communication Modality Model) theory. Through the analysis of the development status of fitness APP and the current situation of the use of college students, and the data collected by questionnaires and other methods, the association of the acquisition of exercise knowledge and the stimulation of exercise willingness was analyzed. The study found that the use of fitness APP has a significant impact on the improvement of college students' exercise knowledge, and the exercise knowledge positively affects the willingness to exercise. Meanwhile, interpersonal communication plays a mediating role in the impact of fitness APP use on exercise knowledge. According to the research results, suggestions are put forward for college students and fitness APP developers.
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