Why do cardio machines need two hands to monitor heart rate but smartwatches only need one wrist?
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A smart watch uses light and a sensor to ‘see’ the blood pulsing through your skin.
A cardio machine runs a little bit of electricity through your body and because your heart uses electricity to beat it can see changes in how the electricity comes back. Because you need to complete a circuit that includes your heart it uses two points on your hands.
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