https://heartofenglandforest.org/news/grounding-get-barefoot-forest Grounding, sometimes also called ‘Earthing’, is simply being or walking barefoot on the ground. The surface must be natural e.g. soil or grass in the Forest, rather than a pavement or man made walkway.

Our modern lifestyles and fashions remove our contact with the earth. We largely spend our days indoors or outdoors with rubber sole non-conducting shoes, meaning we hardly ever come into direct contact with the surface of our planet.

https://www.feathersinthewoods.com/2020/07/what-is-earthing-grounding.html?m=1 You are getting healing energy directly from the earth’s surface, which is why it is important to touch actual earth like dirt or real grass, nothing man-made like gravel. You’ll want to take off shoes and socks also.
It doesn’t have to be your feet – You can get the same benefits from digging in the dirt, playing in the sand at the beach, trailing your fingers through a stream……