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You can trace the state of health tech today to a single gadget: the Apple Watch Series 4.

Back in 2018, smartwatches and fitness bands focused on a handful of things: step count, heart rate, some light sleep monitoring, and activity logging. As a result, they were much more focused on fitness rather than overall health. Handy if you were trying to increase activity levels or lose a few pounds, but not a device th …

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