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As Amazon works to shoulder its way into health care, a new study — funded by the company — suggests that a feature of its wearable devices can accurately assess users’ mobility.

Last year, Amazon released a movement health feature — included in a subscription membership add-on for the company’s Halo wearable devices — that uses a smartphone camera and app to assess a person’s functional mobility by observing five simple movements, including squats and lunges. The feature, called Halo Movement Health, generates an overall score from 0 to 100, identifies weak points in people’s mobility, stability, and posture, and suggests simple exercises to improve them.

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