This video is about family mountain biking in a fun single-track in Colorado.
Singletrack (or single track) describes a type of mountain biking trail that is approximately the width of the bike. It contrasts with double-track or fire road which is wide enough for four-wheeled off-road vehicles. It is often smooth and flowing, but may also feature technical rocky sections, go over tree roots, and include berms, banked turns, switch-backs, hills, drops, jumps, and so forth. Singletrack which descends significantly, and in the most downward direction, is said to be following the fall line.