What if a high-tech ring worn on your finger could help you manage stress, sleep better and generally live a healthier life? Those are among the promises of the newest lines of “smart rings, ” which track your movement, measure your heart rate and temperature and gather data on everything from menstrual cycles to signs of sickness. Our reporter put them to the test, wearing the rings for two months to see if they’d help her become a better version of herself. Here’s how it turned out – plus: she shares which ring she liked the best.

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