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https://www.health.harvard.edu/staying-healthy/rating-heart-monitors
https://ihtusa.com/benefits-of-heart-rate-monitors-in-physical-education/
https://www.consumerreports.org/exercise-fitness/how-to-use-your-heart-rate-to-help-you-work-out/
https://www.unm.edu/~lkravitz/Article%20folder/wearabletechnology.html
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