A general rule of thumb is that a 150 lb person burns about 5 calories per flight of stairs.
Or depending on your speed, 10-20 calories per minute. This is actually pretty intense exercise - it's just that most people don't climb stairs for all that long.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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