Mountain biking is a sport which consists of riding bicycles off-road, often over rough terrain, using specially adapted mountain bikes. Mountain bikes share similarities with other bikes, but incorporate features designed to enhance durability and performance in rough terrain.
This individual sport requires endurance, core strength and balance, bike handling skills, and self-reliance. XC type mountain biking generally requires a different range of skills and a higher level of fitness than other types of mountain biking. Advanced riders pursue steep technical descents and, in the case of freeriding, downhilling, and dirt jumping, aerial maneuvers off of specially constructed jumps and ramps.
Riders learn to repair their broken bikes or flat tires to avoid being stranded miles from help. Many riders will carry a backpack, including a water bladder, containing all the essential tools and equipment for trailside repairs, and many riders also carry emergency supplies in the case of injury miles from outside help.