If your heart rate is up for an extended period of time, I would say that's aerobic. If it's up in an anaerobic state and then back to resting, then back up past the aerobic state again. That's more anerobic. But, even extended anerobic exercise works your aerobic state. But it doesn't work the other way around, if your heart rate never goes above the aerobic state, it's strictly aerobic. I think that's why so many people get good results from interval training.




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