A best-evidence approach was used in which Cochrane, Best Evidence, and Medline databases were searched for meta-analyses and systematic review articles, randomized controlled trials (RCTs), and longitudinal observational studies that used the Nagi's disablement framework to examine the outcomes of physical activity or exercise programs performed by older adults (>60 years). The different types of interventions used in the articles were defined as the independent variables and the disablement outcomes were defined as the dependent variables. The authors only included articles published between 1995 and 2002, focused on older adults, written in English, and which assessed disablement outcomes, particularly functional limitations and disability as defined by Nagi. Studies that examined the effect of exercise on arthritis were included because it is reported to be the leading cause of functional limitations. On the other hand, specific conditions (e.g., Parkinson's disease, chronic obstructive pulmonary diseases, interventions that focused on balance training, etc.) were excluded.