After seeing in the news that a man in China had ran a 50K event in his living room, Gareth Allen, 47, felt immediately inspired to do something similar. He took out his tape measure, headed out to his back garden and worked out how many laps it would take him to complete a marathon. After some pretty serious calculations, he realised he could do it, but something was still missing for his usual racing experience. ‘My favourite part about running is not actually running itself, but instead it’