I wonder if this might have anything to do with the amount of negative ions generated by the surf? I know it sounds silly and no I'm not a hippy chick or anything (nothing against them I'm just not one). It sort of makes sense when you think about the fact that humans are primarily made of atoms and molecules, with ions having a role in the biological process of things like nerve impulse transmission, muscle contraction etc. Ions are basically atoms that have gained or lost electrons, resulting in a net electrical charge. Anyhoo just a thought. Full geek out moment over!