why our leg vibrate whan we sit on a chair
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A shiver is caused by your muscles tightening and relaxing in rapid succession. This involuntary muscle movement is your body's natural response to getting colder and trying to warm up. Responding to a cold environment, however, is only one reason why you shiver.
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Shaking legs can also signal that you're bored. The shaking releases tension that's stored up when you're forced to sit through a long lecture or a dull meeting. Constant bouncing in your leg might also be a motor tic. Tics are uncontrollable, quick movements that give you a feeling of relief.
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