Participation in trail running is up 17% since 2006 with a total of 4.9 million participants nationwide, according to the latest report from the Outdoor Industry Association. While the sport is gaining in popularity, it’s still a fringe sport compared to road running, which boasts 43.9 million participants. Meanwhile, a whopping 98.4% trail runners participate in other sports. Half of them are paddlers and a quarter of them are climbers. And here’s something you probably already knew: the Southeast is a hub of trail running activity, with 24.3% of the nation’s trail runners, by far the largest share of any other region in the country.