I love mountain biking, What do you think about it?
I really enjoy it!  I especially like to ride on mountain trails, singletrack, fire roads, and other unpaved surfaces.
Riding on the trails is great, Mountain bikes were in fact pioneered by Americans to be recreational. 
Trail riding is fun!  I like to ride on  trails, bridle paths, and forest roads, but not on roads regularly used by motorised traffic.
Yeah riding mountain bikes on the pavement is not fun. I think its so cool how Norway hosts the largest mountain bike races, They are over 53 miles long!
reliance. Advanced riders pursue both steep technical descents and high incline climbs. In the case of freeride, downhill, and dirt jumping, aerial maneuvers are performed off both natural features and specially constructed jumps and ramps.
Mountain bikers ride on off-road trails such as singletrack, back-country roads, wider bike park trails, fire roads, and some advanced trails are designed with jumps, berms, and drop-off to add excitement to the trail. Riders with enduro and downhill bikes will often visit ski resorts
known as trail centres. There are "trail bike" designs for this activity.
Categories Marathon.
Mountain Bike Touring or Marathon is long-distance touring on dirt roads and single track with a mountain bike.
With the popularity of the Great Divide Trail, the Colorado Trail and other long-distance off-road biking trails, specially outfitted mountain bikes are increasingly being used for touring. Bike manufacturers like Salsa have even developed MTB touring bikes like the Fargo model.
Mixed Terrain Cycle-Touring or rough riding