Fitness videos first emerged in foreign countries. After the continuous development of domestic fitness industry in recent years, they have gained new vitality in the self‐media platform. Generally speaking, fitness broadcasters display training actions in video clips and impart training‐related knowledge, which in turn stimulates the audience's desire for fitness and enhances the popularity and influence of fitness broadcasters. The audience's interest in fitness videos is mainly affected by the anchor's gender, image, interest, and video content. At the same time, the audience's behavior of rewarding the broadcaster in the video, and the broadcaster's behavior of promoting fitness supplements through personal influence, promoted the emergence of the "fitness economy". This research uses data capture to analyze the content of fitness videos on the N=5000 bilibili bullet screen video platform. The research results show that the popularity of fitness videos is related to personal factors such as the gender and posture of the fitness broadcaster, and has a certain correlation with the season. Research can clearly analyze users' hobbies of fitness videos in the video platform. Based on the fact that bilibili is aimed at young Chinese user groups, the research can more intuitively reflect contemporary young people's thinking about fitness, which has great reference significance for the development of fitness business in China.