PHYSICAL CULTURE FOR CHILDREN
each—indeed are so violent that no one could do many of them consecutively. While work of this sort makes the muscles which it uses large and strong; it does little or nothing for the unused muscles. Nor does it give the lungs nearly as much, or as protracted, though easier work, as many other gymnastic exercises; or as nearly all sorts of athletic exercises. The work of the runner; the oarsman; the boxer, fencer, wrestler, skater, bicyclist is made up of many vigorous but not violent efforts, lasting over many minutes, with a slight rest after each; while the gymnast and weight-lifter condenses all his strength into one supreme effort. The systems of Delsarte, Ling, and Jahn avoid the hard work of both the gymnast and athlete; going through instead, an extensive system, of many movements, some with, others without apparatus; admirable for the body and limbs; yet none of them violent or likely to be exhausting; indeed often not building up large muscles and limbs at all. Others like Dr. Charles Wesley Emerson; Checkley; and Miss Mabel Jenness, a pupil of Emerson's; instead of muscle-building and athletic performance; have aimed chiefly to enlarge the vital box—the house, where heart and lungs and stomach live—and to do this in good part by a variety of breathing and stretching exercises. Checkley, for instance says—
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