All of us want to do more and it's all too common to feel as though there aren't enough hours in the day. Unfortunately though, our energy is finite and when we push too far or too fast we will inevitably burn out and have to give up. This is not only very upsetting because it means we aren't able to do everything we would like to – it's also a very unpleasant feeling that leaves us drained, exhausted and prone to illness.