Passage Summary: Studies show that people who exercise more have less lung disease. Because of this, the author concludes that exercise is what's making people healthy.

Conclusion: Aerobic exercise is definitely responsible for improving people's overall health.

Reasoning: Multiple surveys have shown a correlation between frequent aerobic exercise and a reduced risk of developing lung disease.

Analysis: This argument makes the classic mistake of confusing correlation with causation. Just because exercise and lower lung disease risk happen together doesn't mean one causes the other; perhaps people with healthy lungs are simply more likely to exercise. Furthermore, the conclusion makes a broad claim about 'health' in general based only on data regarding 'lung disease.'