the pace of your runs is essential to improving, it's key to have the correct variation. "You need to make your recovery runs really easy and your hard runs really hard," explains Chris Frapwell, coach to GB Olympic marathon hopeful Dan Robinson. "Easy runs
BAD HABIT: You’re a night owl Runners who short-change sleep compromise recovery, immunity and mental sharpness, which can turn an easy workout into a gruelling one. "Sleep enhances the restoration of cells damaged by exercise," says Professor Jim
