Of course, some old coaches may think of some rhythmic movements while dancing, which is also possible. Because rhythmic gymnastics usually takes four eight beats as a group when jumping, and then changes actions in the next four eight beats. Moreover, because of the simple movements of rhythmic gymnastics, the exercise heart rate is improved mainly by repeating fixed movements. So we can target some experienced old coaches. But even so, few coaches will improvise deliberately in the course because it is easy to make mistakes. To say the least, even if there are no mistakes, the coach can't effectively interact with the members and control the atmosphere of the course because he has to keep thinking about the next move of the course, which will also be a failed course.
To sum up, a qualified and responsible coach will make reasonable arrangements and course design for his own courses before class. These preparations are to provide members with safer, more scientific and more effective training.
Only apples are left, 2013-11-29.
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