Since I naturally pace while I talk on the phone this ones not much of a stretch for me. I walk up and down the stairs while on the phone. I try not to go so fast that I'm out of breath or trip. but I do maintain enough of a pace to keep my heart rate slightly elevated. If it starts to be too much for normal conversation I'll do one trip up and down and then walk a flat area for a moment and then do the stairs again.
Using this method I can keep my exercise level at a manageable level and not get out of breath.
