The Redefinition of Running
In its simplest form, I think trail running is nothing more than travelling quickly on foot over land. On flat, smooth land this means we are running quite fast and very evenly paced. On steep, uneven land this might mean we are walking much of the time and covering less than 4 or 5 miles an hour on average. Throw mud, snow, rain, wind, etc into the mix and things become even more varied.