“Despite gruelling physical and psychological demands, ultrarunning is booming. Any run longer than a conventional 42.105km (26.2-mile) marathon can be considered an ultramarathon, but events are diverse, ranging from road and mountain races to multiple days of running through deserts. There has been a 1,000 per cent increase in the number of races taking place in the last decade and overall participation has skyrocketed.” How ultrarunners are pushing the human body beyond all limits. (I have a theory that there’s a pretty clear ratio between how far one runs and how one feels about one’s family.)