I've been into cycling for about 4-5 years now. Started on a 03 gary fisher wahoo that i'd ride around town and on mups all the time./ the last few years i've been riding fixed and have neglected my other bikes. I am sad to say that having owned a mountain bike for almost 5 years I had never taken it "off-road" (pee gravel rails-to-trails excepted). This weekend I went camping in N. Wis and brought the ole GF along. I found out about some singletrack next to a state campground across the street. I thought it was just going to be a nice little offroad path through the woods---turned out to be a manicured trail with steep declines, jumps, low hanging branches, steep inclines, rocks, sand, fallen tree limbs, twists, turns---you name it.
All I have to say is what a fracking rush. I can't believe I had never done this before. Riding through the 4 mile loop, I couldnt decide at first whether I was scared to death or actually having fun. That and talk about a workout. My legs havent been that sore in a long time.
Anyway---I am now a convert and will be seeking out more trails this weekend.