Physicians, as a relatively small number in medical personnel in hospitals, are always neglected in workplace health promotion in Taiwan. Limited by high stress, uncertainty of work time, and unexpected nature of medical practice, physicians have constraints in participating workplace health promoting activities. In the study, a total of 18 physicians with and without participating the event of "walking for fitness" were completed in-depth interviews to explore their motivation and challenges on participating the event and regular exercise, self-perceived exercise benefits, coping strategies for constraints, and suggestions on future directions. Qualitative data were analyzed and themeized under the theoretical frameworks of the planned behavior theory, health belief model and coping strategies. SWOT analysis was also performed to understand their current internal and external situation. The results identified that "simple and achievable" and "personal goal oriented" are two main accessible approaches for physicians to participating health promotion activities. The study recommends that focus groups and standardized questionnaires are viable ways to collect physicians' experience in health promotion participation in further research. In addition, the concept of diversity is also recommended when designing workplace health promoting activities in the future.