GETTY IMAGES Better sleep. That's all that could be standing between you and a new PB. Too good to be true? Not according to Mara Yamauchi, who set a new marathon PB (2:25:03) at the International Women's Marathon in Tokyo in November. "Sleep is one

GETTY IMAGES Better sleep. That's all that could be standing between you and a new PB. Too good to be true? Not according to Mara Yamauchi, who set a new marathon PB (2:25:03) at the International Women's Marathon in Tokyo in November. "Sleep is one

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

with stress is finding the ‘off' switch, and without sufficient sleep, that just isn't possible, according to Professor Jim Horne from the Sleep Research Centre at Loughborough University. "Reducing regular sleep by just one hour each night can lead to a

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

be stored in toxic levels if taken at levels significantly higher than these.DOCTORRecognise the signs"Disturbed sleep, a higher resting heart rate, increased rates of perceived exertion and even depression can point towards overtraining, as your blood sugar