Your Original Apple Watch Can't Use One of watchOS 4's Best Features
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Best heart rate monitor apps for Apple Watch in 2023 - iGeeksBlog
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AskPCMag: How Accurate Is the Apple Watch's Heart Rate Monitor? | PCMag
6 Best Heart Rate Monitor Apps for Your Apple Watch - Geekflare
The 4 Best Smartwatches, Fitness Trackers, and Running Watches for 2023 | Reviews by Wirecutter
Healthcare - Apple Watch - Apple (CA)
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The Apple Watch heart monitor sends too many people to the doctor - The Verge
Apple Watch and Irregular Heartbeats
Best Apple Watch (2023): Which Model Should You Buy? | WIRED
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