Test practitioners' ability to apply motivational interviewing principles and evidence-based behavior-change techniques to design, tailor, and evaluate brief interventions that increase physical activity among sedentary adults. Items will require selecting appropriate BCTs (goal-setting, action planning, self-monitoring, prompts, relapse prevention), demonstrating MI skills (open questions, reflective listening, eliciting change talk), adapting to readiness and barriers, and interpreting outcome measures and ethical considerations.