Is anyone big into trail running? I'm thinking about getting into it since I love hiking and I love running. I've run a couple marathons so far and a half and some 5k's and run on my streets regularly. I didn't know if it works to train on the streets and then to run trail races or if you'd need to train on the trails. I can't really train on the trails a lot-well I don't want to drive 20 min. every day to a trail to run, when I can walk out my door and start more easily. Anyone out there trail running and have advice?