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Got a Fitbit? Thought you were achieving your goals? Better read this

Simon Harris Silver badge

"They don't measure continuously, fitness machines only measure when you have a firm grip on the electrical contacts and that's not possible during vigorous movement"

It can be worse than that - There have been occasions in the gym where the HRM on my treadmill was still displaying after I let go of the handles - it turned out that the person on the next treadmill had a radio linked HRM and my treadmill was picking up their signal - it did make me look rather fitter than usual for a while!

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