To truly relax you have to do nothing. Our bodies AND our brains need this down time. You don't have to spend hours doing this but a few minutes a day will change your life and how to view your life.
We all know how to relax on a beach so take a good look at this picture.....close your eyes. Now imagine yourself lying on the beach. Take a few moments and enjoy the sun, the sand and the sound of the ocean. This is a great video to watch and listen to while you are relaxing.
If you would like to learn more relaxing techniques the Mayo Clinic has some great ways to relax.