Differnt ways of measuring heights.

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I noticed that there are many ways to measure height, and the results might be different. I mean measuring heights barefooted.

For example, if one was standing measuring his height barefooted, he got like 170cm which is around 5'7. When he lies on the floor, also barefooted, his height might be almost 172cm, almost 5'8, because probably the heel muscles or heel pads were not fully compressed like his standing. Should that person claim his height 172 or 170 when barefooted?

Both of which were measured in the night.

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Quote from: Medium Drink Of Water on September 06, 2021, 04:42:45 AMHe also needs to lie on his stomach to do the measurement, and stand on his head.  He needs to do those things in the morning, at noon, in the evening, and at night before bed.  Then average the 16 numbers.  That is his "true" height.
Stand on his head? What does that mean???