The rapid development of cities and the arrival of the post-pandemic era have brought widespread attention to public health issues. At the same time, the continuous deepening of the national fitness policy has led to an increasing demand for fitness facilities among residents. As a crucial spatial link in high-density residential areas, improving the service efficiency of community greenways is essential for promoting national fitness behavior. This article selects the Guashan Future Community Greenway in Gongshu District, Hangzhou City, as a research case and collects service evaluation questionnaires from greenway users through questionnaire surveys and field surveys. Descriptive statistical analysis, correlation analysis, quantitative analysis, and other methods are employed to examine the behavioral characteristics of users and assess the services. The results indicate that there are significant differences in the activities carried out by users of different ages on greenways, and the preferences of the 18～29 age group for various activities are more balanced and diversified. The age of users is negatively correlated with their frequency of using greenways; There are significant differences in the frequency of greenway usage among users with different residential areas and the time required to reach the greenway, and both are positively correlated; The evaluation of future community greenway services in Guashan is rated as “good”, with the lowest scores in terms of green visibility rate, utilization rate of key population activities, and density of peripheral traffic stations on the greenway. Finally, based on the above research results, explore the optimization strategies for Hangzhou community greenways to support national fitness.