Water is essential for your body to function. You are around 65 per cent water, and water is necessary for everything from blood volume and heat regulation, to the digestion and absorption of the food you eat. You lose fluid all the time – as water vapour in your breath, through your skin as sweat and through excretion. And, as you exercise, especially at high intensities and in warm conditions, fluid losses increase.
Drinking to replace your fluid losses is something you do instinctively throughout your life. But when it comes to sport and exercise, the messages around how much you should drink, and the content and composition of that liquid, can seem pretty complicated. So what,
