Did you know that our body is made up of two thirds water, and without it our bodies would die within just a few days? Our brain consists of 95% water, our blood 80% and our lungs 90%, so that is why it is so important to make sure you keep hydrated especially during this heat wave. Even a drop of only 2% in our body's water content can take a toll on your daily physical activities; dizziness, lack of concentration, daytime fatigue can all be signs of slight dehydration. So, how much water should we drink before, during and after exercise?