Based on Azjen’s The Theory of Planned Behavior published in 1985, this study explored the potential variables and predictions of intention of hospital staff from the Republic of the Marshall Islands to exercise during leisure time. The target population for this study included employees from two Marshall Island hospitals, who were surveyed for data collection. From a total of 300 surveys distributed, 278 surveys were returned, in which 107 were completed by men, and 165 were completed by women. The average age of the participant was 41 years. From the data collected, a preliminary factor analysis method was established, followed by validation and analysis of this method. From descriptive statistics, confirmatory analysis, and structural equation modeling for data processing, the following results were found: 1. Attitudes, subjective norms, and perceived behavioral controls for Marshall Island hospital employees’ exercise intentions were explained with a variance of 43.6%，these three main variables all attained a significant correlation with regular exercise’s intention . While attitudes, subjective norms, and behavioral controls all had the ability to predict exercise intentions, perceived behavioral controls were the most influential factor, followed by subjective norms, and finally attitudes 2. Behavioral results beliefs had the positive correlation with behavioral attitudes.3.rmative beliefs, compliance motives, had the positive correlation with subjective norms.4.perceived ability had the positive correlation with perceived behavioral controls. But control beliefs had no correlation toward perceived behavioral controls The results suggest that the variables mentioned in The Theory of Planned Behavior significantly influenced the exercise behavior of Marshall Island hospital employees. From the results, attitudes, support of significantly others, and perceived behavioral control and willing to participate were proposed to promote the facilitation of behavior strategies, and enhance the level of exercise participation. In addition, the health department and hospitals were advised to provide a variety of physical activities, and raise the quality and accessibility of exercise facilities. The results also suggest that the Marshall Island health department hire professional trainers, encourage hospital staff to increase their physical activity, and strengthen employees to recognize the benefits of exercise.