I got a Garmin FR 610 last summer and it's been great since then. However recently there have been instances when it's wildly inaccurate when estimating calories burnt. Yesterday I ran just over 2 miles and it estimated I'd burnt 150 calories, which is close to average but a little under. Today was the worst - I ran 8 miles and it said i'd burnt 113 calories. I do wish my body was that efficient but it took me 1 hour and 20 minutes so I'm sure I burnt a few more than that!
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