By Philip Ellis Former triathlon athlete Mark Threlfall has been throwing himself into some pretty grueling ultra-running challenges this year over on the Global Triathlon Network channel, including running a half-marathon every single day for a week. (Spoiler alert:...
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Known for his extreme and superhuman feats of athleticism, David Goggins continues to inspire countless others to push themselves to the limit. For athlete Mark Threlfall, that meant a 48 mile (approx. 77 kilometre) run in just 48 hours for charity.
