There is no doubt that physical strength, muscular development, and endurance are greatly responsible for perfect muscular coordination. Subsequently, proper exercise produces this co-ordination, because it develops strength, muscle and endurance; but exercise goes even further in producing muscular co-ordination. It produces perfect health and nerve strength, also, and these two are very essential to muscular co-ordination, especially nerve strength. Of course, you know that muscular co-ordination is, in plain words, a perfect harmony of muscular action ·or actions produced by nerves and muscle of the highest order. You can see that your eyes· and hearing have much to do with muscular co-ordination.