Hello from Wisconsin
Being new to MTB I got a Trek 3900 a few months ago and have been doing about 15 miles a day on a flat trail for most of that time mostly to get used to the bike and to get in some kind of shape before I actually take on some kind of real challenge.
This past Friday I put that very limited training to the test on a trail called Underdown in northern Wisconsin. And that trail chewed me up and spit me out! I got a lot more work to do but I'll be back for more of "fun".