that people suffering from sleep deprivation often make poor decisions, can't focus and become unmotivated. Lack of sleep can also compromise your immune system, which is already vulnerable during training: those who get six hours or fewer of sleep have 50 per
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
by more than 60 per cent, reducing blood pressure and strengthening their immune system. The results were so significant, the researchers concluded, that not having close friends is as detrimental to your health as smoking or carrying extra weight. Add
