Grounding or earthing is said to benefits by getting rid of the positive ions that build up in our bodies from the everyday stresses and strains. These positive ions are like free radicals and can lead to ill health and chronic disease. By walking on grass or mud barefoot it synchronises you with the earths negative irons. It is said to help reduce inflammation, bring down high blood pressure, de-stress us loads of things.
It sounds quite a hippy concept, but it is very natural and 'what we used to do'. Unfortunately, shoes and flooring, paths and roads have got in the way. Additionally, parents often tell their children not to go outside unless they have their shoes on. So this ancient remedy has got lost over the years.
Give it a try!