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On a treadmill, why is the degree of incline shown on the machine not the true incline?

Asked by 2davidc8 (10189points) September 25th, 2018

I once read somewhere that if you set the treadmill at the gym at, say, 8 degrees, it’s not really 8 degrees. It’s really either 16 (i.e., twice the reading, or 4 (half the reading) degrees, I can’t remember which.
First question: which is it, twice or half?
Second question: why did the manufacturer do this?

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