1. How many people did the study track? 2. Based on the study, what activities should people do to extend their life and reduce illness? 3. What will happen when people do more exercises? How long is the recommended time for physical activity per day? 5. Why do cardiovascular diseases cause such a bad effect on countries? 6.How many people were killed by cardiovascular diseases in 2006? 7. What is the advantage of walking for 30 minutes a day? 8. What kinds of physical activity did WHO recommend? 9. For what ages did WHO recommend the physical activity? 10. If more people reach the guideline levels, what will happen? 11. What is the estimation from the experts about the guidelines? 12. Which example of physical activity is 'free and brings health gains?​