I started running on and off in about ... 2010 or so. It's been very much a bell curve for me, in 2015 I was routinely running 10 - 15 miles, and did three lots of Paras 10 (https://paras10.com/the-races/paras10-tab/) tabs. I did the Catterick 10 miler, fully loaded with 15kg of weight, in about...