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The 10,000 step goal was invented in 1965 by a Japanese pedometer company. It had no clinical basis then and has only weak evidence now. Most wearables count steps using flawed accelerometer guesswork, which means your 8,000 step day and your friend's 8,000 step day are not the same health outcome.
A Stanford study tested seven fitness trackers against clinical instruments. Heart rate was accurate. Energy expenditure was off by 27 to 93 percent on every device. The calorie number on your screen is not a measurement. It is a guess.
