Asymptomatic

I hate lateral thinking.  The answers to the puzzles usually don’t
make any sense.  How can you answer a question when all of the facts
aren’t presented to you in the beginning?  There are a couple that
make some sense, though.  Here’s one that isn’t too bad:

A man lives in an apartment on the 35th floor.  He gets in the
elevator to leave his building for work.  He hits the button for the
first floor, gets off there and goes to his office.  At the end of
the work day, he returns home, gets in the elevator and hits the button
for the 32nd floor.  He gets off on the 32nd floor and takes the
three flights of stairs to his apartment.  If he didn’t do it for the
exercise, why did he get off the elevator to take the stairs up?