People assigned to the PEPAF group will be COMPARED to patients of family doctors randomly assigned to the control group in which any systematic intervention on physical activity promotion has been postponed until year 2006, except for those patients whose health problems were directly related to a sedentary lifestyle. The average changes observed in the two groups will be compared, on the basis of intention to treat through analysis of covariance. The investigators will use mixed-effect models to take into account intra-patient, intra-doctor and intra-center correlation.