Physical activity and children.

In addition to informing physicians of the benefits of childhood physical activity, the purpose of this editorial is to differentiate physical activity from health-related physical fitness, to emphasize the impediments to physical activity that children face, and to make recommendations for improving chil- dren's physical activity, physical fitness, and physical education. A society is often measured by how it prepares for its future; informed adults must provide the opportunities for children because they are the future.