Puzzles/Lateral puzzles/9

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Every morning, a young man wakes up to go to work. He gets ready and then leaves his apartment, which is on the thirteenth floor of an apartment building. He walks out of the elevator and goes to work.

Later that evening, he returns to his apartment building and goes into the elevator. He hates to walk or exercise, however he presses the tenth floor button and walks up the other three stories.