Exercise machines are devices that train activity skills. It can be divided into part task trainer and overall task trainer. The former is used to train some of the activity skills; the latter is used to train the entire activity skill or most of the activity skills.
In general, a complex skill activity can often be broken down into a number of relatively independent action groups that can be independently trained with a partial task trainer. This can shorten the training time of the overall task trainer and reduce the cost of training. However, the role of the partial task trainer does not replace the role of the overall task trainer. Because a perfect set of motor skills is connected in a specific way by different groups of motor skills, it must be completed through the training of the overall task trainer.
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