Recently, The Institute of Medicine issued a report recommending an hour of moderate activity daily for maintaining healthy weight and decreasing risk of heart disease.

From a time-management standpoint alone, an hour a day may seem unrealistic for many of us. If you take a closer look at the report, however, you'll see that the institute takes a broad view of "moderately intense activity": gardening, light housekeeping, walking the dog and using stairs instead of elevators all contribute to an active lifestyle.

In terms of more straightforward exercise, you can meet the hour-a-day guideline by walking at 4-5 miles per hour for a total of 60 minutes daily or engaging in higher-intensity exercise, such as jogging, for 20 to 30 minutes 4 to 7 days a week.