Is there a recommended HR for the "relaxed" and "intense" portions of interval training? If I went hard for a minute, would that be at 85-90% of max heart rate? And then during the relaxation phase, would I wait until I drop back down to 55-60%?
I generally do cardio on an elliptical trainer and I want to experiment a bit with interval training.
I generally do cardio on an elliptical trainer and I want to experiment a bit with interval training.

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