The problem, which has been not described in the special literature on sports, is mentioned in the article. The question is the cause and the effect structure of movements and any analysis is impossible without its understanding. It causes numerous difficulties and mistakes with which the process of development of sports exercises is so "rich". The movement of an athlete is executed according to the chosen kinematical program. It represents the result of the active purposeful work of an athlete. Thus the end result of motor actions depends not only on intentions, but also upon a lot of factors. Even the most artlessly constructed exercises quite often include the components which have been not stipulated by the executor and sometimes completely not dependent on his will. The author describes physical factors of movements of an athlete and offers readers the classification of casual types of movements. Except for it, the structure of casual difficult movements is presented in the article.
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