Assess understanding of major behavioral theories (Social Cognitive Theory, Theory of Planned Behavior, Transtheoretical Model, Self‑Determination Theory, Health Belief Model) and core determinants (self‑efficacy, motivation, outcome expectancies, social support, barriers, symptom burden, environmental context) that influence physical activity adherence in adults with chronic disease; include analysis of determinant interactions, implications for measurement, and how findings guide tailored intervention strategies and behavior change techniques.