Omraam Mikhael Aivanhov gave a couple of techniques to charge your solar plexus, which is the energy reservoir for the brain. It's like a battery that can be charged with a current from two electrodes.

The first technique is done while sungazing. The sun is the positive electrode. He doesn't say anything about the feet, but I would add standing on the bare earth with bare feet, since the earth is the negative electrode. Extend your left hand out to the sun and put your right hand over your solar plexus. Your solar plexus is located between the navel and the tip of the breastbone. Visualize the life force flowing from the sun through your left hand and directly into your solar plexus. Curve your thumb and fingers of your right hand as if you were holding a 6-inch diameter ball of energy. It’s important that your spine is straight. It’s best done while sun gazing, but anyone can do it at other times without having to gaze at the sun.

Another solar plexus charging technique that anyone can do at any time is to stand with your back straight against a tree trunk; the bigger the better. Put your left hand behind your back between the trunk and your back with palm facing the trunk. Put your right hand over your solar plexus. Be sure to thank the tree for the energy you get, just as you thank the sun.