Define an intervention in physical activity and describe four reasons to justify why an intervention may be needed. Explain how physical activity can be both an outcome variable and an intervention variable in exercise intervention research. Classify five types of interventions according to their content. Describe three generic stages common to many interventions in physical activity. Describe different outcome dimensions associated with physical activity interventions. Describe differences in the scope of interventions and the types of settings and populations to which interventions may be applied. Come between so as to prevent or alter the result, or course of events". Too many people are sedentary for prolonged periods each day. Physical activity counselor (pac) in an integrated health care team. Less risk of diabetes, hypertension, colon cancer, cvd. Enhances ability to perform activities of daily living. Pa has many personal and societal benefits; many can be considered from a public health perspective.