Allow the breath with your attention as it moves in and out of your body.  Breath into the body, and feel your abdomen expanding and contracting slightly with each inhalation and exhalation.

If you find it easy to visualize, close your eyes and see yourself surrounded by light or immersed in a luminous substance - a sea of consciousness.  Then breath in that light.  Feel that luminous substance filling up your body and making it luminous also.

Then gradually focus more on the feeling.  Don't get attached to any visual image.  You are now in your body. You have accessed the power of Now.

From Practicing The Power of Now, Eckhart Tolle, page 69