Usually, if it's over 3 floors I take the lift, because my back usually acts up by then, gone are the days of playing "run outs" in the building, legging it up and down the stairs every few minute.
These days, what with being ill, I think my building care taker is playing a joke on me. The lift on my side of the building doesn't work, no problem, I'll take the stairs, it's only 6 flights, no wait I can't, the keys don't work in the communal doors as they are midway through changing the locks. Ok so fine I'll go to the other side of the building and use the lift to go up to the 5th floor and walk across and back down. Except now, those lifts aren't working either. So now I have to walk up 10 flights of stairs, walk across the building and down 4 flights of stairs. Scary thing is, despite being more painful than a painful thing, I'm actually starting to quite enjoy it