This book describes proven methods for helping people change from inactive to active living. The behavior change methods are useful for healthy adults as well as individuals with chronic physical and psychological conditions. The book describes intervention programs for individuals and groups and for workplace and community settings. Part 1, "Theoretical Background and Tools for Measuring Motivational Readiness," includes (1) "Description of Physical Activity Interventions"; (2) "The Stages of Motivational Readiness for Change Model"; (3) "Integrating Other Psychological Theories and Models"; (4) "Learning about Physical Activity Mediators"; (5) "Evaluating and Measuring Physical Activity Mediators"; and (6) "Successful Physical Activity Interventions Using the Stages Model." Part 2, "Applications," includes (7) "Assessing Physical Activity Patterns and Physical Fitness"; (8) "Using the Stages Model in Individual Counseling:; (9) "Using the Stages Model in Group Counseling Programs"; (10) Using the Stages Model in Work-Site Programs"; and (11) "Using the Stages Model in Community Programs." Organizations and suggested readings are appended. (Sections contain references.) (SM)