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Fell, as described by our contributing writer, Claire Maxted:
Fells are what people in the north of England (especially in the Lake District) call mountains and hills. Hence, fell running. Nothing to do with falling, but you may also do this a lot as the terrain is really rough and steep.
This film shows a slice of trail-running life with fell runners across the pond. It turns out, trail runners are much the same, no matter in what country they reside.