How much physical activity is needed?

At a minimum, do moderate intensity activity for 30 minutes most days, or preferably every day. This is in addition to your usual daily activities. Increasing the intensity or the amount of time of activity can have additional health benefits and may be needed to control body weight.

About 60 minutes a day of moderate physical activity may be needed to prevent weight gain. For those who have lost weight, at least 60 to 90 minutes a day may be needed to maintain the weight loss. At the same time, calorie needs should not be exceeded. Children and teenagers should be physically active for at least 60 minutes every day, or most days.

While 30 minutes a day of moderate intensity physical activities provide health benefits, being active for longer or doing more vigorous activities can provide even greater health benefits. They also use up more calories per hour. No matter what activity you choose, it can be done all at once, or divided into two or three parts during the day. Even 10-minutes bouts of activity count toward your total.

Most adults do not need to see their health care provider before starting to exercise at a moderate level. However, men over the age of 40 and women over the age of 50 planning to start vigorous physical activity should consult a health care provider. Individuals with one of the conditions below should also consult a health care provider for help in designing a safe program of physical activity.

• A chronic health problem such as heart disease, high blood pressure, diabetes, osteoporosis, asthma, or obesity.

• High risk for heart disease, such as a family history of heart disease or stroke, eating a diet high in saturated fat, trans fat and cholesterol, smoking, or having a sedentary lifestyle.