Applied anatomy and kinesiology, the mechanism of muscular movement . f the way around aspossible. With toe clips to attach the foot to the pedal the workcan continue practically all the way around the circle, the extensorsacting to push part of the way and the flexors acting to pull itaround during the balance of the revolution. This uses the flexorsas well as the extensors in the work and there is another advantage—the force used is not limited by the weight of the body as it is in thesimple downward push. One limb flexing and the other extendingreinforce each other, requiring less action of
Applied anatomy and kinesiology, the mechanism of muscular movement . f the way around aspossible. With toe clips to attach the foot to the pedal the workcan continue practically all the way around the circle, the extensorsacting to push part of the way and the flexors acting to pull itaround during the balance of the revolution. This uses the flexorsas well as the extensors in the work and there is another advantage—the force used is not limited by the weight of the body as it is in thesimple downward push. One limb flexing and the other extendingreinforce each other, requiring less action of the trunk and armsfor this purpose. There is probably no bodily mechanism capable PLAYS, GAMES AND SPORTS 317 of exerting so much force per minute as this way of driving thebicycle. The position just described uses the extensors of the spine insuch an elongated position that it is bad for posture when taken ^C^ W> ^^ni&w ^^^^^t-^^H WCj ^^/^JP^ r ^r$\ x/jft^^ viipy W)\\ ^^^~mmm^sssg&&m Fig. 191.—Bicycling, erect position. (Photo by Ethel Perrin.). Fig. 192.—Bicycling, stooped position. (Photo by Ethel Perrin.) too often or for too long a time. Since boys are apt to be moreinterested in speed than in posture it is important to teach themhow to follow the pedal with the foot and to have their bicyclesequipped with toe clips, so that they can get the racers speedwithout his characteristic hump. CHAPTER OCCUPATIONS. The bodily movements involved in industrial occupations, likethose of play and sport, include both the handling of objects andlocomotion. In sport locomotion is perhaps the more prominentof the two, but in industry the reverse is true. This has come aboutbecause in the displacement of muscle by machinery it is the fieldof locomotion that has been invaded most. While boats, steamtrains, trolley cars, automobiles and elevators now do most of thetransportation of people and freight—once done by muscularpower—many of the primitive ways of handli
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