Lots of good comments in this thread. Just want to add that there are 'grounding/Earthing shoes' that have a copper portion built into the sole of the shoe so that you have an electrical connection with the ground. There are also grounding mats/pads that connect to your electrical socket to provide a grounding effect indoors.

Sand, soil, dirt, clay, and these sorts of things give an awesome grounding effect, and the more skin contact you have with them the more profound the effect. There's a documentary somewhere about an Alaskan man who researched this effect.