=The importance of physical culture.=--This chapter is added for the reason that perfect health, perfect development, perfect virility, perfect manhood is not possible without physical culture. Physical culture includes bathing and exercise. The healthful functioning, of the entire digestive system, the kidneys, the liver, the lungs, the heart and the brain, are related, vitally, to physical culture. Likewise the retention, absorption, distribution and assimilation of the creative life are also vitally related. Bathing and massaging the body and physical exercise have a remedial effect upon almost all physical disorders. =The functions of the skin.=-Stop the functions of the skin three minutes and death follows. The skin has two functions, one is to eliminate poisons from the body and the other is to conserve and regulate the heat of the body. =The wild tribes.=--In prehistoric times the people wore little or no clothing. In some of the coldest countries wild tribes go almost naked. Under these conditions consumption and many modern diseases are unknown. Clothing is not needed by these people. The skin is able to conserve sufficient heat. =Modern customs.=--The wearing of clothing and the neglect of physical culture has to a large extent destroyed the natural functions of the skin. The function of conserving heat is nearly lost by the skin. When the skin is not kept clean and healthy it loses, to some degree, its power to eliminate poisons. When this occurs the kidneys are forced to do overwork. This results in kidney disease. =Getting back to nature.=--For people to go naked again is out of the question. Modest, pure-minded, civilized people must wear clothing. Clothing conceals defects, improves bodily appearance and protects the body from heat and cold. Getting back to nature simply means that we are to restore to the skin its natural functions of conserving heat and eliminating poisons. =The air bath.=--In athletic exercise the skin is incidentally exposed to the air and sunshine. This largely accounts for the benefits derived. On arising each morning fifteen minutes should be devoted to restoring and maintaining the natural functions of the skin. This is done by throwing off the clothing in a fairly cool room, exposing the skin to the air. The skin should be rubbed with the hands or a fairly rough towel until it is stimulated into warmth. It is well to vary the rubbing, using the hands part of the time and the towel part of the time. After the skin has become warm, one can take fifteen minutes of physical exercise, attend to shaving and other features of his toilet, remaining, meantime, entirely or partly naked, to a very great advantage. The open air bath can take place of much of the cold and hot water bathing. Water baths should be taken twice or three times a week and those should be followed by ten or fifteen minutes’ rubbing the body and exercising, in the open air.