Purpose: This study aimed to investigate the effects of a structured aerobic exercise program on pulmonary function and cardiopulmonary indicators in rural coastal older adults to inform future community health promotion initiatives. <p> Methods: From March to December 2024, 72 community-dwelling individuals aged 55 and above from four rural coastal villages in Yunlin, western Taiwan, were recruited. Baseline data were collected, including age, waist circumference, and grip strength. Participants completed a 10-week exercise program consisting of one session per week. Each incorporated a warm-up, muscle strength training, and a cool-down phase, with moderate-intensity exercise guided by trained volunteers. Key health-related fitness components were assessed, including maximal inspiratory pressure (MIP), maximal expiratory pressure (MEP), and peak expiratory flow for pulmonary function, as well as heart rate, blood oxygen saturation, and blood pressure. Data were analyzed using paired-sample t-tests in SPSS 22.0, with statistical significance set at p<0.05. <p> Results: The participants had a mean age of 74.6 years; 65.8% were female, and 36.8% had no formal education. Significant post-intervention improvements were observed in pulmonary parameters: MIP, MEP, and peak expiratory flow all increased significantly (p<0.001). Cardiopulmonary indicators demonstrated mixed results: resting heart rate and blood oxygen saturation remained relatively stable, while systolic blood pressure showed a slight, non-significant decrease (p=0.057) with diastolic blood pressure revealing no significant change. Additionally, waist circumference decreased significantly (p=0.046), whereas grip strength remained unchanged (p=0.824). Overall, the aerobic exercise program improved lung function and selected fitness measures. <p> Conclusion: These findings indicate that moderate aerobic exercise helps enhance respiratory muscle strength and overall pulmonary function in rural coastal older adults. Given its low cost and noninvasive nature, exercise is a valuable strategy for maintaining and improving respiratory health in the aging population. Future research should explore its long-term effects on cardiopulmonary function and overall fitness in similar populations.