08/09/2026
If you finish a weights session and check your watch to see how hard you worked, don’t treat every number on that screen the same way.
Heart rate and calories burned might sit next to each other, but your watch arrives at those numbers very differently.
A 2026 study tested four popular smartwatches during cardio and resistance training to see how those metrics actually held up.
Swipe through for the breakdown 👉
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📚 Lee et al. (2026), Comparative Validity of Smartwatch-Derived Heart Rate and Energy Expenditure During Endurance and Resistance Exercise. Sensors, 26(8), 2526.