Based on the background of building a common strategic plan for a healthy China and a digital China, the application scenarios of digital health are showing an increasingly rich development trend and their growth potential is expanding. This study delves into how persuasive design influences users’ emotional encounters within the Keep app (An exercise and health application) and examines the connection between this emotional involvement and users’ usage patterns, to bring more and more effective solutions for achieving success in persuading people to form a sustainable healthy lifestyle. Based on the FBM behavioral model (Fogg behavioral model), the Keep app persuasive design is classified into the motivation element oriented to provide feedback and rewards, the competence element oriented to provide courses and personalized customization of plans, and the trigger element oriented to situational triggering and voice guidance, and adopts the PAD affective model and self-reported questionnaire to combine the persuasive design with the user’s emotional experience, which not only provides the quantitative data support, but also deeply explores the user’s emotional experience in the emotional experience, and the user’s emotional experience in the emotional experience. It also explores the users’ feelings and feedbacks in terms of emotional experience. The analysis results show that different persuasive design modules generate different emotional experiences, which have different strengths of influence on user behavior. Meanwhile, practical suggestions on how to optimize and improve the persuasive design of sports and health apps, and how to balance the relationship between persuasion and user autonomy are proposed, which provide certain references and insights for designers and researchers in the field of digital health related areas.