Your smartwatch might be giving your workouts more credit than they deserve

TL;DR A new study finds that popular smartwatches from Apple, Samsung, Garmin, and Fitbit substantially miscalculate calories burned during exercise. The higher your body fat percentage, the less accurate your smartwatch’s calorie estimates may be, with errors reaching 100% or more. Researchers recommend treating smartwatch calorie counts as rough estimates, especially if you rely on them to manage your weight.