Physical activity is an important component of healthy ageing - a topic that is becoming increasingly relevant to society due to demographic change and rising life expectancy. In order to promote physical activity in the long term, awareness of the influence of physical activity on health and interest in exercise among older and very old people must be increased. The book now published creates an evidence-based basis for the design of effective and efficient communication measures. Using a combination of methods including guideline-based interviews and a standardized telephone survey, the decisive behavioral determinants and health information behavior of people aged 65 and older in Germany were identified. On this basis, an evidence-based communication strategy was formulated for older and very old people in Germany as a whole and for particularly vulnerable sub-target groups.