foods to ensure adequate mineral intake. Also do not completely eliminate salty foods from your diet. These will help to ensure you have adequate electrolytes to balance fluid losses each day.—Joe Beer, sports scientist and level two triathlon coach

‘scared’, and not keeping track of your intake. Next time, drink only fluid-replacement drinks (about 600-750ml per hour) and not water. And practise drinking these amounts in your pre-race training runs. —Joe Beer, sports scientist and level-two triathlon

drink containing electrolytes (body salts). High-intensity training and long, slow runs can even be improved by using a carbohydrate-based energy drink during and after the session. Aim for 400-700ml of energy drink per hour of exercise. Drink 400ml