The federal government has released its first ever "Physical Activity Guidelines for Americans," which provides physical activity recommendations for people of all ages and physical conditions. "The evidence is clear--regular physical activity over months and years produces long-term health benefits and reduces the risk of many diseases," said Mike Leavitt, secretary of the U.S. Department of Health and Human Services (HHS).

Children who are physically active for at least one hour or more each day gain substantial health benefits as well, HHS said. The guidelines recommend one hour or more each day of moderate or vigorous aerobic activities such as bike riding, jumping rope, running, and such sports as soccer, basketball, and ice or field hockey for children and adolescents. In addition, vigorous intensity physical activities like hiking, skateboarding, bicycle riding, and brisk walking are recommended three days per week for children and adolescents.

(http://www.schoollibraryjournal.com/article/CA6603287.html?industryid=47074)