Assess students' ability to analyze how different types of physical activity (aerobic, anaerobic, mixed) and varying intensities (low, moderate, high) affect immediate heart rate response, short-term endurance outcomes, and recovery patterns in Grades 6–8. Tasks include interpreting simple heart-rate and time-to-fatigue data, comparing activities, identifying confounding factors (fitness level, rest, measurement error), and designing or critiquing a brief classroom protocol to measure and improve recovery and endurance.