It is recomanded to isolate each muscle you want to train in order to get the maximum results. This mean you should only be using force on a specific area of your body for that particular moment.
为达到最好效果，最好是单独训练每个肌肉群，这就是说，在练习期间，针对在身体的特定区域做特定练习。
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The most important element that affects the specific throwing speed is the lower limbs explosive force , then the body force and last lower limbs maximum force.