Written By Sam Heward
Sam is one of the Ultra X Co-Founders. If he's not actually out running, chances are he's busy writing about it (or plotting Ultra X strategy!)
This week, we chat to the incredible John Stocker.
John recently broke the world record at the Suffolk Backyard Ultra, running an astonishing 542km in 81 hours – despite having run the 145 mile Grand Union Canal race just the week before!
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