An analysis is presented of data on participation in leisure time and physical activities by such groups as the general population, employees, and students. Studies were made of community sponsored programs, employee fitness programs, and student physical activities. Leisure time physical activity findings are described within the categories of: reported physical activity; reasons for such behaviors; attitudes and perceptions regarding physical activity; changes in physical activity patterns; and fitness-related information. The range, participation level, and operational costs of employee fitness programs are briefly described. It is noted that there is very little dependable information available at this time on student physical activity in the nation's schools and colleges, and that information for elementary schools is almost completely absent. Suggestions are offered for data collection and analysis on this topic, and issues which should be addressed in future research are identified. (JD)