I had great success with this technique to charge the chakras, it is a great technique especially combined with a good brainwave entrainment CD such as the Insight CD or Mindtek. ( I used Mindtek at that time Insight CD wasn’t out yet but today I would go with the Insight CD or something from Brain Sync such as their Deep Meditation program)
This form pranic breathing will recharge all the chakras.

• Lie down comfortably on your back have your body in a straight line (arms, legs)
• Inhale for 6 counts, retention of your breath from 3 counts, exhale your breath for 6 counts.
  Do these cycles of breathing for seven times and rest a moment between each cycle.
  Now, accompany each inhalation in turn with one of the following mental exercises.
  Do them in the order given, the first with the first cycle, the second with the second cycle, and so on until the seven exercises have been performed.

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