The title says it all. How do you folks deal with the urge to move? At what point does scratching an itch once or twice become a hindrance to practice? What about small movements (not getting up, just stretching and the like)?

Oh, and I should probably say--I have Tourette's Syndrome (not the kind with yelling obscenities) which sometimes makes not moving an impossibilitiy, but aside from that, how do you work with impulses to move?