The main aim of the project is to develop and test a personalized ICT based intervention aimed at behavioral change in people who have recently retired, in order to decrease risk for age-related functional decline. We will target the consumer market, and not the health care system. The intervention consists of small bouts of exercise integrated in daily life, where wearable sensors (a smartphone and a wrist watch) are used to give feedback on physical behavior, motivate for further activity, and socialize with others. The main outcome from the study is a complexity metrics for physical behavior derived from monitoring of physical activity and sleep by use of body worn sensors. A cloud based platform will be established to communicate and store information of the sensing systems. User interfaces aimed at older people will be developed. Motivation for exercise, usability of ICT solutions, use of unobtrusive technology, and data protection will be paid particular attention. The project also aims to develop tools for monitoring and assessing physical behavior, using data from body worn sensor systems.