Assess students' understanding of how different types (e.g., walking, running, jumping, stretching) and intensities (light, moderate, vigorous) of physical activity change heart rate and breathing, and why those changes keep the body healthy. Include tasks to identify examples, compare immediate responses (faster heartbeat, deeper breaths), and explain simple short- and long-term benefits (better oxygen delivery, stronger heart and lungs, improved endurance and recovery). Appropriate for Grades 3–5; moderate difficulty requiring explanation and comparison.