Living in a wooden house is the best way to keep fit. Findalin and negative ions (air vitamins) in Riel's wooden house are tens to hundreds of times higher than those in reinforced concrete houses. Fantacin and negative ions are the favorite substances of modern forest bathers, which can kill bacteria in the air, inhibit human diseases and enhance immunity. It has obvious effects on restoring consciousness, improving attention, lowering blood pressure, calming autonomic nerves and making people feel relaxed and free.