Assess Grade 6–8 students' understanding of the differences between aerobic and anaerobic exercise: definitions and typical examples, basic energy systems (oxygen use vs anaerobic metabolism), how duration and intensity determine which system is used, immediate physiological responses (heart rate, breathing, muscle fatigue, lactic acid) and long-term benefits (endurance vs strength). Include comparison and short-answer items requiring explanations of how each type affects the body and overall health.