Older people are a very heterogeneous population characterized by a high interindividual variability. Functional abilities (walking, transfers ...) used to classify individuals aged (Lalive d'épinay et al., 1999) in three categories: independent, frail and dependent (HAS, 2005). Frailty is generally considered as a state that precedes dependent status and, unlike the latter, is still reversible (Fried et al., 2001). Now, it's necessary to understand and quantify the indicators above the dependence of the elderly from a multidisciplinary approach to frailty, is a critical public health issue for developing non-drug therapeutic interventions adapted to delay the institutionalization. Through this study, it is to identify risk and protective factors of frailty and their relationships with physical activity, evaluate them and propose an appropriate care to the patient. This study should enable the production of new scientific knowledge to improve the health and quality of life of older people.