This year I have an elevator but I've successfully eschewed it no matter how tired every day and no matter how many times I stop back at home for stuff or to drop things off.
NB: I'm on the 6th floor (US) of my building (5th FR).
I even took the stairs the two times students have needed to stop over with me real quick - one time I BEAT them to the apt. even tho they took the elevator (and got in the same time I started up the stairs); the other time I got up to my floor just as they were exiting the elevator. Yes, my elevator is fairly old and slow, but still... not too shabby I think.
If I don't get in shape this summer it won't be my fault!