Less injurious than sport, and much easier to be performed, is walking exercise. As walking on the level does not necessitate great exertion, unless performed rapidly, it can give good results if continued for a considerable distance. It is desirable to walk as much as possible, and never to use a street car or a carriage unless pressed for time; by this means health may be greatly improved. In walking especially the muscles of the lower extremities are contracted, and at the same time the circulation is improved, the more so, of course, in the lower extremities, but also in other parts of the body; and this is still more the case when we walk briskly. For those possessing a good circulatory mechanism, it is always advisable to walk briskly, thus indulging in a healthy and practical and muscular exercise; and for such, also, running for a few minutes several times daily is excellent, as perspiration can thus be created, whereby harmful products are eliminated from the body. This latter exercise is more suited to those living in the country, or if in cities, to those who have a garden or large yard. It is advisable not to run too fast, as such would cause severe exertion with bad effects upon the heart; but if undertaken at all it should only be for a minute or so. Running at a moderate speed, breathing deeply and rhythmically at the same time, and with rhythmical, rather short steps, can be kept up even for eight to ten minutes without any particular harm to the circulatory system. Personally we used to do this, and often, when the thermometer stood below zero, without hat or overcoat, finishing thoroughly warm and comfortable. Standing still after running, when so attired, might lead to catching cold, but running out of the house and back again without stopping causes no such risk, even in a strong wind, as we have personally proven. Such running may best be done three times a day, before breakfast, dinner, and supper, as this running in and out of the garden is the best of appetizers, and is far more beneficial than drugs for those men and women who sit about all day and complain of want of appetite. Such running practice is only good for those who have sound blood-vessels, heart and kidneys. Deep regular breathing while exercising is also indispensable. Walking up a hill will naturally require greater exertion than walking on the level, and may be more beneficial to the health than sports conducted to a similar degree. At first the blood-pressure will increase, but it will afterward decrease. Deeper respirations will have to be taken, so that a larger supply of oxygen will be brought to the lungs and tissues.