Air has led us to mention already the first of exercises, which is walking; and for those who have strength to indulge themselves in this, there is none better: but feeble limbs, and various accidents, often deny its use to those who most of all want motion. In this case, riding on horseback is the next in excellence: and the fittest hours of the day must be chosen for that, in the same manner as for the other. In severe weather it will be necessary to ride under shelter; and at all times to avoid damp or bleak places. Many diversions afford also excellent exercise: bowling is one: but the same care must be taken, that this be done at a proper time. A chariot may supply the place of a horse, to such as are more feeble; and for those who are so weak as to find even this too much, there will arise a great deal of good from being driven along in those chairs which are made to run upon gravel walks. To such as are fond of gardening, nothing affords so happy, or so constant exercise. We do not mean that they should dig, or weed the ground: but to use such employment as will give exercise without labour; and such as no hand will so well perform as that of the master. Such are the trimming of shrubs, and flowering plants; the management of espaliers, the removal of seedling flower-roots; the thinning of fruit upon the trees; and the following and overlooking the other several works. Here will at least be more, and brisker walking than would be otherwise; and in many things the little use that is made of the hands will complete that exercise, by continuing it perfectly through the body. The only danger in this healthy and happy course, is, that it is too alluring. Let him who delights in it take an invariable resolution, never to let his fondness for the garden carry him out too early; or keep him there too late. CHAP. VII. _Of succedaneums for exercise._ The benefit of exercise all know; but all cannot enjoy it: nor can it be had at all times. The very weather will some days deny the use of those kinds we have named to such as are most able to take them. In this case, any bustling about within doors, whether in the way of business, or amusement, will in some degree answer the purpose. The adjusting an escritoire; or the new arranging the volumes in a book-case, have often produced this good effect: and billiards, or other entertainments which afford the means of stirring within the house, all answer the same purpose.