http://bodydivineyoga.wordpress.com/2011/03/23/the-psoas-muscle-of-the-soul/

...."I was literally energizing my deepest core by reconnecting with the powerful energy of the earth"...."believes that by cultivating a healthy psoas, we can rekindle our body’s vital energies by learning to reconnect with the life force of the universe"......"The psoas is intimately involved in such basic physical and emotional reactions, that a chronically tightened psoas continually signals your body that you’re in danger, eventually exhausting the adrenal glands and depleting the immune system”.....

Lossening the psoas muscle can not only benefit you physically but emotionally too bringing you deep muscular relaxation and healing.