This is a good exercise to practice when you have a few quite moments.  Then use it during those days that just seem to drain all the energy from you.  Source: Psychic Self-Defense by Melita Denning and Osborne Phillips.  The more often you successfully complete the exercise, the easier it will be to call upon when you need a quick defense to strengthen your aura.  It is called the Tower of Light. (1) Breathe deeply.  (2) Progressively relax your body.  (3) Stand erect without any body stiffness, your arms by your side.  You can also do this during a casual walk or while sitting.  If sitting, place your palms down on your thighs, feet parallel and planted firmly on the floor.  (4) Visualize all around you a long ellipsoid of intense blue light extending about 9 inches beyond the surface of your body and about 16 inches above your head and below your feet.  (5)  When you are aware of this blue light completely surrounding you, visualize at the summit above your head a globe of brilliant white light.  (6) Concentrate on this globe of white light above you so that it becomes as bright as possible.  (7) Be aware of the bright globe of light above you and also the bright blue light totally surrounding you.  (8) Aspire to the highest good you are capable of realizing through loving, grateful thoughts, memories, and feelings.  (9) When you are at a higher vibrational level, see the bright globe above your head sending down glittering white light.  This white light is filled with silver sparkles and floods over and through you.  (10)  See the outer blue light surrounding you while the glittering silver-filled white light continues to sprinkle over and through you.  (11) Continue your concentration on this image as long as you can.  When you feel ready to release it, let the globe fade from your consciousness.