In the newer iPhones (6 and up?) there are electronics that act like an altimeter. Track little forward progress and a change in altitude and you might have a flight of stairs. At an Apple support site someone with a similar query as mine got this response: "According to the Health app, a flight of stairs is counted as approximately 10 feet (3 meters) of elevation gain (approximately 16 steps)."
ryck
"What Were Once Vices Are Now Habits" The Doobie Brothers
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