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here is a link to one of the more exotic practitioners of "earthing". Go ahead and skim it, you might learn something.
This is almost always presented as a mental imaging exercise, thus the advice to :
The first part of grounding is to get rooted in your physical body.
Grounding is a similar concept to centering. The Center is expansive, including your body as well as your mind, heart, and spirit.
Once you learn how to ground yourself, it’s easier to find your Center. Grounding techniques are designed to redistribute the energy from your head or mind into your body. Doing so has an almost instant calming effect.
Close your eyes and as you inhale, trace the air as it enters your nose and goes into your lungs. On the exhale, follow the air leaving your lungs and exiting your nose or mouth.
This grounding technique gets more effective with practice. The key is to observe the breath instead of forcing it with your mind. Let your body lead and your mind will follow.
Stand with your feet parallel and at least shoulder’s width apart. Keep your head floating above your body, chin tucked, and spine straight. Rest your hands at your side or place them over your navel.
Sink all of your body’s weight and tension into your feet (without collapsing your posture), allowing it to be absorbed into the ground. To support this grounding process, imagine roots growing out the bottom of your feet, extending deep into the ground beneath you.
All of these are simple meditation techniques. There's nothing especially new or radical about them, and they are probably borrowed from other disciplines, like yoga or Buddhist meditation techniques. It makes no difference to me or anyone else who uses them with some success whether you think it's a bunch of hooey. After a while, you begin to expect that from the more opinionated. Not a big deal, but why the compulsion to pee on the parade ? Is that how you choose to ground ?
A certain percentage of chronic pain complaint are associated with chronic misuse patterns and with chronic muscle tightness and associated shortening. Meditation is one approach to dealing with them.