We must do sport

Scientific research has shown that even regular and light physical exercise can reduce a person's chance to die of heart attack. You don’t need to be a marathon runner.
One kilometer's walk a day, several days per week can drop the risk of heart disease. The regular practice of sport keeps you in good health, and makes you live longer. People who do not do sport are likely to die earlier than those who are physically active.

Vocabulary    
Light: léger