According to the AHA, all Americans should be regularly physically active to improve overall health and fitness. People who aren't physically active are much more likely to develop health problems. Even moderately intense physical activity, such as brisk walking, is beneficial when done regularly for a total of 30 minutes or longer at least 5 days a week. Lack of physical activity increases your risk for heart attack and stroke and can contribute to obesity. On the other hand, regular physical activity helps to reduce blood pressurecontrol weight and reduce stress.