How Much Exercise is Enough?

For children and adolescents(ages 6-17)
One hour or more of physical activity every day, including at least 3 days a week of vigorous-intensity aerobic activity and of muscle-and-bone-strengthening activity.
Adults(ages 18-64)
2 1/2 hours a week of moderate-intensity or 1 hour and 15 minutes a week of vigorous-intensity aerobic physical activity, or an equivalent combination, performed in episodes of at least 10 minutes, preferably spread throughout the week. Adults should also do muscle-strengthening for all major muscle grouops on two or more days per week.
Older adults(ages 65 and older)
Follow the adult guidelines unless chronic conditions prevent you from doing so. Also do balance exercises.