What is it you do constantly to keep you alive?

What is it you do constantly to keep you alive? I will give you a hint, it is something you have been doing since you came into the world and, it will be the last thing you do when you leave the world?  You don't give a second thought and if you do it a certain way, it will increase the growth, function and performance of your brain! Ok, so you have probably guessed it is 'breathing' and you know that it is crucial because your body needs oxygen to survive. Did you realise that you breathe in 432 litres of oxygen everyday? And, your brain uses 3 times as [...]