Giddy over new MFP+Body Media link!!

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Today is the first day I saw the link between my MFP and BodyMedia accounts in action and I love it!

Anyone else liking this new feature?

I do wonder how it knows I exercised, though. I ran for 45 minutes and my HR was in the "vigorous" zone but the calories burned for that 45 minute period were actually slightly (about 40cal) lower than MFP is stating. I suspect it doesn't know when to end the workout? IDK, any thoughts?

TIA!