Your smartwatch isn’t as accurate at tracking calories as you think. Here’s what is

Smartwatches are great tools for keeping track of your activity. They can monitor your heart rate during a workout and track your sleep, and some even help manage workout recovery. But several studies show smartwatches and fitness trackers don’t do as good of a job at calculating calorie burn during activity and can be off anywhere between 40% to 80% of your actual energy expenditure.
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