Fitness games provide more possibilities for improving individual physical health and contributing to ecological sustainability. However, there is limited research on the user experience of fitness games. In this study, using fitness games as an example, we explore the factors influencing user satisfaction with fitness from the perspective of game attributes and prioritize these factors. The research involves distributing 510 survey questionnaires and constructing a structural equation model to examine the relationships between usefulness, functional quality, playfulness, technical quality, ease-of-use, social interaction, and user satisfaction. The study reveals that the core factors influencing user satisfaction are usefulness and playfulness. Additionally, the other factors mutually influence each other and collectively contribute to users’ evaluations of the usefulness and playfulness of the game.