Spinning your pen or pencil in your fingers, tapping your foot to some imaginary tune, absentmindedly shaking your knee…these have all been the bane of school teachers even before fidget spinners were a thing, so much so that one of my HS professors tried to convince our class that the latter was a form of involuntary masturbation.Okay, you still shouldn’t wriggle around during high-pressure meetings because it’s seriously distracting and off-putting, but doing so in the comfort and privacy of your desk and cubicle can actually help you burn an extra 350 calories a day, potentially helping you keep off those excess pounds.