HIIT is High Intensity Interval Training...intervals of high intensity, followed by intervals of lower intensity, which repeat. It burns more calories than a steady state workout.
Sheila, my settings depend mostly on heart rate/perceived rate of exertion. I typically go 1 minute at a 9 on a scale of 1-10 level of exertion...just barely under the fastest I can go. Then I go 2 minutes at about a 5-6...a moderate pace. Then I repeat. You may have to tweak the settings to find what puts you at that level...maybe you can do it solely by increasing/decreasing speed (sprint for a min, then go slower for recovery) instead of having to change the resistance all the time.
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