Assess graduate-level understanding of major behavior change theories (Health Belief Model, Theory of Planned Behavior, Transtheoretical Model, Social Cognitive Theory, Self-Determination Theory), their core constructs and comparative strengths/limitations, and the application of these theories to design, tailor, and evaluate interventions that promote physical activity among older adults—addressing common barriers (mobility limitations, chronic conditions, motivation), relevant behavior-change techniques (goal-setting, self-monitoring, social support, autonomy support), and basic measurement/evaluation considerations.