In a sauna, the heat acts more quickly to eliminate toxins through the skin, though some consider the moist air of a steam bath to have a more satisfying effect on the respiratory system. Saunas are deeply relaxing and are a great way to melt away stress. A sauna is an eliminative procedure; it stimulates blood flow, increases the heart rate, has an immune-modulating effect, promotes hormone production, encourages mucosal secretions in the respiratory system, opens the airways, reduces resistance to respiration, regulates the vegetative system, relaxes, and can improve mental outlook. Children can start to take saunas at two or three years of age.