Running a marathon used to be the standard bucket list achievement, with the sport seeing massive growth in the last 10 years or so. But ultra running, once the domain of an elite minority, is also fast becoming a mainstream activity increasing by 1,676 per cent in the past two decades.
Runners and walkers of all abilities can take part in events from 28 miles to a staggering 3100 miles in all corners of the globe. The most common distances, however, are 50k, 100k and 100 miles.
