In 3 experiments including 100 males and females per age category we explore:(1)which environmental characteristics are considered to be most supportive of physical activity in men and women of 3 different age groups (adolescents, adults, elderly)(2)which environmental characteristics are considered to be most supportive of physical activity for those that are more active compared to those that are inactive of sedentary(3)whether the relationship between critical environmental characteristics and physical activity are moderated by personal and psychosocial determinants.