There is a combination sport named mountain bike orienteering which adds the skill of map navigation to mountain biking.
Because riders are often far from civilization, there is a strong ethic of self-reliance in the sport. Riders learn to repair their broken bikes or flat tires to avoid being stranded miles from help.
This reliance on survival skills accounts for the group dynamics of the sport. Club rides and other forms of group rides are common, especially on longer treks.
This individual sport requires endurance, bike handling skills, and self-reliance. From gravel road to singletrack (narrow trails that wind through forests, mountains, deserts, or fields), mountain bikes traverse them all.