While You're Up

"While you're up..." ---a term used by a seated individual at the beginning of a sentence addressed to a standing individual, generally followed by a request or favor to do something a little more than what the standing individual had originally planned.

EXAMPLE:

"While you're up on a chair dusting shelves . . .would you straighten and rearrange a few things too?"(Disclaimer: In this example I was both the seated and standing individual.
But you get the point, right?)