Hmmm. I dunno. I've just got off the plane, lugged my oversized carry-on bag down the steps, across the tarmac, into the airport, up one concourse and down the other.
If I can work up a sweat in this fashion for free, why should I pay for a rushed workout in a cramped micro-gym? What I'd really like instead is a massage, a sauna, a shower, my clothes freshly laundered and dry cleaned and my shoes polished for me in that same hour.
I guess I'm just weird like that.