This document summarizes research on promoting physical activity. It finds that: 1) Simply communicating health risks is not effective at changing behavior, but combining risk information with strategies to improve self-efficacy and response efficacy can have larger effects. 2) Brief interventions that focus on goal setting, action planning, and overcoming barriers can successfully increase walking levels. 3) Techniques shown to improve both self-efficacy and physical activity include action planning, reinforcing progress, instruction, and graded tasks. 4) Older adults want physical activity experiences that are enjoyable, social, and allow improvements in function at their own pace without pressure. Satisfaction and self-efficacy predict long-term