Going barefoot ( i.e. sit, stand, walk, run) outside directly on the earth, or you can swim/paddle in the sea/lake/river, for 30 minutes or more each day. On land, conductive surfaces for being grounded/earthing include soil, grass, sand, gravel, and rock. Concrete is also conductive. Moist surfaces are more conductive than dry. You cannot ground yourself on asphalt, vinyl, and wooden surface; they are not conductive.
If your daily routine, the weather, or surface conditions don’t accommodate outdoor grounding, you can conveniently ground yourself indoors whilst at home or at work using the sleep mat, sleep pillow or the univeral earthing mat. The best opportunity to gain the many benefits of earthing indoors is to sleep grounded.