Assess the ability to apply the Transtheoretical Model and Self-Determination Theory to design a community-based physical activity intervention for older adults by: specifying stage-tailored strategies across TTM stages, integrating SDT-supportive components (autonomy, competence, relatedness), selecting evidence-based behavior change techniques, outlining recruitment and retention tactics for community settings, proposing process and outcome measures for evaluation, and addressing mobility, cultural, and resource constraints relevant to older adult populations.