Google is retrofitting Pixel smartphones with the ability to measure heart rate and respiratory rate, without the need for an additional fitness tracker or sensor.

Google says a Google Fit update will measure these vital signs using only the on-board camera, initially on Pixel phones with plans to expand the feature for more of the best Android phones.

The respiratory rate, which is the number of breaths in and out per minute, is measured simply by placing your head and upper torso within the selfie camera frame.
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