Here is a great talk about it from a doctor withouth any new age babble. He gives very simple advice and even backs up his claims with some research.

The gist of it is: - For 15 minutes a day sit down and try not to think/observe your body/observe what is going on in your dead - Do this for 30 days, after that your brain should pick it up and do it more or less automatically

This made a huge differenc in my life for sure.