In 2011, outdoor recreation among Americans reached the highest participation level in the last five years. Nearly 50 percent of all Americans ages six and older, or 141.1 million individuals, participated in at least one outdoor activity in 2011, making 11.5 billion outings. In fact, last year, Americans enjoyed 1.4 billion more outings than the previous year. Compared to 2010, participation in outdoor activities increased slightly among all age groups from 6 to 44, while participation among those ages 44 and up remained relatively flat. Read more of the 2012 Topline Outoor Recreation Report, produced by the Outdoor Foundation.