Test learners' ability to design a scalable, evidence-based intervention and trial protocol that integrates wearable activity trackers, behavioral economics nudges, culturally tailored exercise prescriptions, and community partnerships to reduce sedentary behavior and improve cardiometabolic health among underserved urban adults. Require specification of study design (e.g., RCT or hybrid effectiveness-implementation trial), sample size and recruitment strategies, randomization and blinding considerations, primary and secondary outcome measures (objective activity metrics, biomarkers, cardiometabolic risk, QoL), process and implementation metrics (reach, fidelity, equity, adoption), statistical analysis plan, cost-effectiveness methods (ICER, cost per QALY), and a pragmatic implementation and sustainability strategy addressing training, community engagement, scalability, and barriers in resource-constrained urban settings.