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Thanks Dani! That's interesting; I didn't realize that there was a difference in what gets burned depending on how fast your heart is beating.
I definitely mix up cardio - actually all exercises, including weighted movements. I don't think it's a myth. If I do only the elliptical for a few months, my body will tire quicker when I go on to the treadmill. It moves your body in a different way. Not sure about the time variants; I think you have to hold your target heart rate up for a certain period of time.
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