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In reply to: your biceps and triceps fire atthe same time very frequently, how else could you hold an object away from your body with your arm half supinated and half pronated
If all the muscle fibers (in the biceps and triceps) contracted fully and at once, there is a very good chance you would tear one or both muscles. The feat which you cite as an example has to do with controlled contraction of a portion of the muscle fibers. You may have taken body parts apart, but no one in his right mind would trust you to put them back together.
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