Presumably just the distinction between the rest of your body being upright and still, but your hands moving very quickly (like something flying) as you solder

Presumably just the distinction between the rest of your body being upright and still, but your hands moving very quickly (like something flying) as you solder or screw or assemble. It occurs to me that there's another sense in which the movement is like an animal in flight, in that pausing the movement to take a break is often not an option.