You can drink more water just because the majority of the brain is water. Thinking, focusing, helping to concentrate better and being more alert are important functions of human brains. In addition, it is said to increase energy levels. Water is especially important to prevent dehydration during long exercises. When exercising for an hour or more, water helps prevent fatigue and fatigue after performance and exercise, and maintains fluid balance. When you feel that your energy is lowering, the first thing that can do is drinking 1-2 glasses of water. The first sign of thirst may be fatigue. The feeling of thirst shows you are too late to drink water. Water keeps you awake and attentive. To refresh your eyes when you need to concentrate for a long time, drink more water. Thirst reduces your attention, disrupts your memory and your ability to move.