If that doesn't work, just imagine your feet like a tree's roots. The idea is for the energy you use to not be completley yours, that you take some from the Earth, so you don't over-exert yourself.
If you don't ground yourself, a lot of negetive effects will take place.
On some smaller cases, you'll feel dizzy, out of breath and weakend.
On larger cases, you'll get sick, pass out, vomit, etc.
I know from experience. I've had a severe cold for a while after performing a difficult attack.
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