Anything which causes one to frequently fill his lungs to their utmost capacity, and then hold them full as long as he can, tends directly to open his ribs, stretch the intercostal muscles, and so expand the chest. Many kinds of vigorous muscular exercise do this when done correctly, for they cause the full breathing, and at the same time directly aid in opening the ribs. It will be observed that frequently throughout these hints about exercising, endeavor has been made to impress on the reader that, when exercising, he should hold the head and neck rigidly erect, and the chest as high as he can. A moment's thought will show why. He, for instance, who "curls" a heavy dumb-bell, but does it with his head and shoulders bent over--as many do--while giving his pectorals active work, is actually tending to cramp his chest instead of expanding it, the very weight of the dumb-bell all pulling in the wrong direction. Now, had he held himself rigidly erect, and, first expanding his chest to its utmost by inhaling all the air he possibly could, and holding it in during the effort--a most valuable practice, by-the-way, in all feats calling for a great effort--he would not only have helped to expand his chest, but would find, to his gratification, that he had hit upon a wrinkle which somehow made the task easier than it ever was before. Holding the head and neck back of the vertical, say six inches, with the face pointing to the ceiling, and then working with the dumb-bells at arm's-length, as above referred to, is grand for the upper chest, tending to raise the depressed collar-bones and the whole upper ribs, and to make a person hitherto flat-chested now shapely and full; while the benefit to lungs perhaps formerly weak would be hard to over-estimate. Steady and protracted running is a great auxiliary in enlarging the lung-room. So is plenty of sparring. So is the practice of drawing air slowly in at the nostrils until every air-cell of the lungs is absolutely full, then holding it long, and then expelling it slowly. Most public singers and speakers know the value of this and kindred practices in bringing, with increased diaphragmatic action, improved power and endurance of voice. Spreading the parallel bars until they are nearly three feet apart, and doing such arm-work on them as you can, but with your body below and face downward, helps greatly in expanding the chest. So does swinging from the rings or bar overhead, or high parallels, and remaining on them as long as you can.