Apple Watch Series 12 Health Features Tested: Step Counting Accurate, Heart Rate Questioned

A Lifehacker reviewer tested the $399 Apple Watch Series 12: step counting works accurately and quickly, but the claimed 'most accurate' heart rate is questionable—the watch takes readings every 5 seconds versus 1 second for a chest strap and Garmin. Live Rewind, Siri Recaps, and Readiness features will arrive later this year.

• Step counter updates quickly and accurately: 9 steps from desk to door = 9 steps
• Heart rate measured every 5 seconds (12 points/min) vs 1 second for Garmin
• Live Rewind, Siri Recaps, and Readiness features not yet available
• Step counting won't come to Series 11 and older models—requires new chip