Grounding is a technique used to realign the bodies energy, or chakra. Your body has a natural flow of energy that cycles through your body from your head to your toes and back again. When a person gets stressed, anxious, upset, etc. the bodies energy can become blocked or disrupted, resulting in unexplained emotional episodes of some kind (depression, outburts, etc.). Grounding allows the body to naturally release the tension or emotion it has been holding.
Grounding is simply allowing yourself, and your children, to play outside barefoot in the dirt, and/or on rocks. The physical connection to the earth allows gently realigns the bodies energy, but most of all brings peace and calmness to the person. Another form of grounding is gardening.
In such cases where one cannot get out and get their toes dirty, stones or rocks can be used, such as the ones seen above, because they carry the earths energy and act the same way upon the body. Warmed balsalt rocks, seen above, have been used for centuries in massage, to help soothe and relax tired muscles. They are placed on the feet to help ground a person, or settle a restless/tired/anxious spirit.