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
." Use training runs to gauge personal fluid requirements. Weigh yourself before and after a run. For every kilogram of total weight lost, you need to be drinking at least one and a half litres of fluid. "That needs to be taken on board before you sense
