Sedentary behavior is not just a lack of physical activity, but it is an ongoing behavior of sitting or lying down for a long period of time. CDC surveillance data shows that about 23.1% of adults aged 65–74, and 35.9% of adults aged 75 or older are inactive, meaning they engage  in no leisure ­time, household, or transportation physical activity.Promoting physical activity among older adults is a national public health priority. A large preventable burden of morbidity, mortality, and health care costs currently exists, and the number of older adults is projected to increase from 13% in 2000 to 20% in the year 2030. Physical activity reduces the risk of premature death and supports positive mental health and healthy aging.