At the age of 50, Eddie Brocklesby decided to run her first half marathon. Until that point, she'd done little running, and her exercise regime consisted of little more than chauffeuring her children to their own sports clubs. In common with so many people, any interest she'd shown in sport in her childhood had diminished as her adult life progressed, with spare time becoming ever more limited in the face of work and family commitments. But the half...