I prefer to use my legs, because pushing against my desk with my arms rocks my monitors, and I dread to think of the long term consequences for my HDD. Unfortunately, I often wear socks. Because it's cold, and I'm not a barbarian. So the floor is too slippery, see. Thus I'm forced to regularly subject myself to the anguish of the choice I don't want to make, and my drive to a premature death.
Honestly, it's a problem.