Trail running outdoor trend

LexisNexis® Academic: Document: "JUMP-STARTING a running regimen is a springtime rite for recreational joggers across the country. But instead of pounding pavement, millions now sprint into the woods, where the growing sport of trail running is bringing exercisers back to nature. About 6.7 million Americans now run on dirt or grass trails once a week or more, according to a 2006 report from the Outdoor Industry Foundation in Boulder, Colo."