Ideally, the CDC says, we should get 2.5 hours of moderate exercise — brisk walking, riding a bike on level ground, that sort of thing — each week. We ought to spend another 75 minutes per week engaging in vigorous activity like running or shooting hoops.
The researchers, who analyzed American Time Use Study data the U.S. Census Bureau gathered from more than 100,000 people nationwide, found teens are the most active, spending about 41 minutes per day exercising. Adults spend about 17 minutes a day, while those 65 and older get roughly 13 minutes of exercise per day.
Walking is the most common activity, with about 5 percent of Americans spending about 53 minutes a week on foot. Among those people regularly breaking a sweat playing a team sport, basketball is the most popular activity. The results are reported in the 2011 edition of Time Use in Australia and United States/Canada Bulletin.