I've been eyeing adventure racing for a while now, that's what gave me the itch to try running. I've had moments when I'll think "ok, lets give the running thing a try" and will leave my house and get tired soooo quickly. I don't stay dedicated to it and then I just ride. I really want to try running some though, it just seems like different type of workout that I could use. Maybe I'll give the advice you gave a try, going to trail and jogging/walking. I think offroad is more my style, running on pavement gets boring and is hard on my knees.