while some studies indicate that the lack of adhesion and adherence to regular and permanent physical activity practices are lower in the lower income and less educated population social economic and educational factors alone do not explain the phenomenon of sedentary behavior there is a high level of physical inactivity even in higher social classes and places where people have more access to information and material conditions for PA practice in the USA for instance only 30.8% of adults aged 18 or over engage in PA activity during leisure time in the case of the older citizens only 24.7% of adults aged 65 to 74 and only 17.9% of adults over 75 yeaer engage in such activity this data leads us to the conclusion thatbalthough social economic and cultural factors influence sedentary beavior levels and/0r adherence to physical activity they alone do not explain low PA engagement