Mountain (MTB) trails, or trails for Experts, intended for those who dedicate a substantial amount of time to off-road cycling and who have mastered the riding technique. Another precondition for conquering these trails is very good physical fitness. They run along roads and footpaths with surfaces of lower quality, usually along unpaved roads and footpaths in mountain terrain and in the woods. They also involve conquering large vertical and horizontal distances. These trails are dangerous for inexperienced cyclists, children and the elderly. To conquer these trails, it is recommended to have a good-quality bicycle designed for mountain biking.