'Letting go' has always been a part of spiritual growth and self-healing. As we go through life we collect emotional/energetic debris. This debris hinders how we feel and often what we attract, from work to relationships. So if you have a pain in your body or a painful memory. Focus on this emotion, image balling this emotion and it's energy up within you and send it out into the universe. Image it leaving you. You may have to do this several times. It is about freeing yourself from the stuck energy and emotions.